ru

Publications

  1. 95. Bender C.M., Brody D.C. Asymptotic analysis on a pseudo-Hermitian Riemann-zeta Hamiltonian // Journal of Physics A: Mathematical and Theoretical - 2018, Vol. 51, No. 13, pp. 135203 [IF: 1.865, SJR: 0.787]
    more >>
  2. 94. Brody D., Hughston L.P. Social discounting and the long rate of interest // Mathematical finance - 2018, Vol. 28, No. 1, pp. 306-334 [IF: 2.414, SJR: 1.98]
    more >>
  3. 93. Aleksandrov I.A., Plunien G., Shabaev V.M. Pulse shape effects on the electron-positron pair production in strong laser fields // Physical Review D - 2017, Vol. 95, No. 5, pp. 056013 [IF: 4.557, SJR: 1.887]
    more >>
  4. 92. Bender C.M., Brody D., Muller M.P. Hamiltonian for the Zeros of the Riemann Zeta Function // Physical Review Letters - 2017, Vol. 118, No. 13, pp. 130201 [IF: 8.462, SJR: 3.688]
    more >>
  5. 91. Proskurnikov A.V., Cao M. Synchronization of Goodwin's Oscillators under Boundedness and Nonnegativeness Constraints for Solutions // IEEE Transactions on Automatic Control - 2017, Vol. 62, No. 1, pp. 372-378 [IF: 4.27, SJR: 3.436]
    more >>
  6. 90. Reshetikhin N.Y. Degenerate integrability of quantum spin Calogero–Moser systems // Letters in Mathematical Physics - 2017, Vol. 107, No. 1, pp. 187-200 [IF: 1.671, SJR: 0.915]
    more >>
  7. 89. Aho V., Mattila K., Kuhn T., Kekalainen P., Pulkkinen O., Minussi R.B., Vihinen-Ranta M., Timonen J. Diffusion through thin membranes: Modeling across scales // Physical Review E - 2016, Vol. 93, No. 4, pp. 043309 [IF: 2.366, SJR: 0.896]
    more >>
  8. 88. Aleksandrov I.A., Plunien G., Shabaev V.M. Electron-positron pair production in external electric fields varying both in space and time // Physical Review D - 2016, Vol. 94, No. 6, pp. 065024 [IF: 4.557, SJR: 1.887]
    more >>
  9. 87. Aleksandrov I.A., Plunien G., Shabaev V.M. Nuclear recoil and vacuum-polarization effects on the binding energies of supercritical H-like ions // The European Physical journal D - 2016, Vol. 70, No. 1, pp. 18 [IF: 1.288, SJR: 0.348]
    more >>
  10. 86. Bender C.M., Brody D., Hughston L., Meister B.K. Geometric aspects of space-time reflection symmetry in quantum mechanics // Springer Proceedings in Physics - 2016, Vol. 184, pp. 185-199 [SJR: 0.156]
    more >>
  11. 85. Bogoliubov N.M. Time-Dependent Correlation Functions for the Bimodal Bose–Hubbard Model // Journal of Mathematical Sciences - 2016, Vol. 213, No. 5, pp. 662-670 [SJR: 0.33]
    more >>
  12. 84. Bogoliubov N.M., Malyshev C.L. Combinatorial Aspects of Correlation Functions of the XXZ Heisenberg Chain in Limiting Cases // Journal of Mathematical Sciences - 2016, Vol. 216, No. 1, pp. 8-22 [SJR: 0.33]
    more >>
  13. 83. Brody D. Consistency of PT-symmetric quantum mechanics // Journal of Physics A: Mathematical and Theoretical - 2016, Vol. 49, No. 10, pp. 10LT03 [IF: 1.865, SJR: 0.787]
    more >>
  14. 82. Brody D., Gibbons G.W., Meier D.M. A Riemannian approach to Randers geodesics // Journal of Geometry and Physics - 2016, Vol. 106, pp. 98-101 [IF: 0.819, SJR: 0.656]
    more >>
  15. 81. Friedkin N.E., Proskurnikov A.V., Tempo R., Parsegov S.E. Network science on belief system dynamics under logic constraints // Science - 2016, Vol. 354, No. 6310, pp. 321-326 [IF: 37.205, SJR: 12.556]
    more >>
  16. 80. Gamayun O., Pronko A.G., Zvonarev M.B. Time and temperature-dependent correlation function of an impurity in one-dimensional Fermi and Tonks-Girardeau gases as a Fredholm determinant // New Journal of Physics - 2016, Vol. 18, No. 4, pp. 045005 [IF: 3.786, SJR: 1.584]
    more >>
  17. 79. Hughston L., Salamon S.M. Surveying points in the complex projective plane // Advances in Mathematics - 2016, Vol. 286, pp. 1017-1052 [IF: 1.373, SJR: 2.281]
    more >>
  18. 78. Ivanov I.P., Serbo V.G., Zaytsev V.A. Quantum calculation of the Vavilov-Cherenkov radiation by twisted electrons // Physical Review A - 2016, Vol. 93, No. 5, pp. 053825 [IF: 2.925, SJR: 1.391]
    more >>
  19. 77. Kirianovskii I., Granichin O.N., Proskurnikov A.V. A new randomized algorithm for community detection in large networks // IFAC-PapersOnLine - 2016, Vol. 49, No. 13, pp. 31-35 [SJR: 0.308]
    more >>
  20. 76. Klimova A., Rondeau E., Andersson K., Porras J., Rybin A., Zaslavsky A. An international Master's program in green ICT as a contribution to sustainable development. // Journal of Cleaner Production - 2016, Vol. 135, pp. 223-239 [IF: 5.715, SJR: 1.937]
    more >>
  21. 75. Malyshev K.L. The Einstein-Like Field Theory and Renormalization of the Shear Modulus // Journal of Mathematical Sciences - 2016, Vol. 213, No. 5, pp. 750-755 [SJR: 0.33]
    more >>
  22. 74. Myllys M., Ruokolainen V., Aho V., Smith E.A., Hakanen S., Peri P., Salvetti A., Timonen J., Hukkanen V., Larabell C.A., Vihinen-Ranta M. Herpes simplex virus 1 induces egress channels through marginalized host chromatin // Scientific Reports - 2016, Vol. 6, pp. 28844 [IF: 4.259, SJR: 1.24]
    more >>
  23. 73. Nikitina M.A., Sokolov A.I. Critical exponents and the pseudo-epsilon-expansion // Theoretical and Mathematical Physics - 2016. - Т. 186. - № 2. - С. 192-204 [IF: 0.984, SJR: 0.416]
    more >>
  24. 72. Nikitina M.A., Sokolov A.I. Pseudo-epsilon expansion and critical exponents of superfluid helium // Physica A: Statistical Mechanics and its Applications - 2016, Vol. 444, pp. 177-181 [IF: 2.243, SJR: 0.64]
    more >>
  25. 71. Proskurnikov A.V., Matveev A.S., Cao M. Opinion Dynamics in Social Networks with Hostile Camps: Consensus vs. Polarization // IEEE Transactions on Automatic Control - 2016, Vol. 61, No. 6, pp. 1524-1536 [IF: 4.27, SJR: 3.436]
    more >>
  26. 70. Proskurnikov A.V., Parsegov S.E. Problem of uniform deployment on a line segment for second-order agents // Automation and Remote Control - 2016, Vol. 77, No. 7, pp. 1248-1258 [IF: 0.492, SJR: 0.331]
    more >>
  27. 69. Proskurnikov A.V., Tempo R., Cao M. PageRank and opinion dynamics: Missing links and extensions // IEEE Conference on Norbert Wiener in the 21st Century, 21CW 2016 - 2016, pp. 12-17
    more >>
  28. 68. Reshetikhin N.Y. Degenerately Integrable Systems // Journal of Mathematical Sciences - 2016, Vol. 213, No. 5, pp. 769-785 [SJR: 0.33]
    more >>
  29. 67. Reshetikhin N.Y., Stokman J.V., Vlaar B. Boundary Quantum Knizhnik–Zamolodchikov Equations and Fusion // Annales Henri Poincare - 2016, Vol. 17, No. 1, pp. 137-177 [IF: 1.599, SJR: 1.119]
    more >>
  30. 66. Smirnova V.B., Utina N.V., Proskurnikov A.V. On Periodic Solutions of Singularly Perturbed Integro-differential Volterra Equations with Periodic Nonlinearities // IFAC-PapersOnLine - 2016, Vol. 49, No. 14, pp. 160-165 [SJR: 0.308]
    more >>
  31. 65. Taghvafard H., Proskurnikov A.V., Cao M. Stability properties of the Goodwin-Smith oscillator model with additional feedback // IFAC-PapersOnLine - 2016, Vol. 49, No. 14, pp. 131–136 [SJR: 0.308]
    more >>
  32. 64. Aleksandrov I.A., Shchepetnov A.A., Glazov D.A., Shabaev V.M. Finite nuclear size corrections to the recoil effect in hydrogenlike ions // Journal of Physics B: Atomic, Molecular and Optical Physics - 2015, Vol. 48, No. 14, pp. 144004 [IF: 1.792, SJR: 0.725]
    more >>
  33. 63. Amelina N., Erofeeva V., Granichin O.N., Malkovskii N. Simultaneous perturbation stochastic approximation in decentralized load balancing problem // IFAC Proceedings Volumes (IFAC-PapersOnline) - 2015, Vol. 48, No. 11, pp. 936-941
    more >>
  34. 62. Amelina N.O., Granichin O.N., Granichina O., Jiang Y. Local voting protocol for differentiated consensuses in a stochastic network with priorities // IFAC Proceedings Volumes (IFAC-PapersOnline) - 2015, Vol. 48, No. 11, pp. 954-959
    more >>
  35. 61. Bogoliubov N.M., Malyshev K.L. Integrable models and combinatorics // Russian Mathematical Surveys - 2015, Vol. 70, No. 5, pp. 789–856 [IF: 1.026, SJR: 0.891]
    more >>
  36. 60. Brody D., Gibbons G.W., Meier D.M. Time-optimal navigation through quantum wind // New Journal of Physics - 2015, Vol. 17, pp. 033048-(1-8) [IF: 3.786, SJR: 1.584]
    more >>
  37. 59. Brody D., Hadjipetri S. Coherent chaos interest-rate models // International Journal of Theoretical and Applied Finance - 2015, Vol. 18, No. 3, pp. 155001 [SJR: 0.469]
    more >>
  38. 58. Brody D., Hughston L. Universal Quantum Measurements // Journal of Physics: Conference Series - 2015, Vol. 624, No. 1, pp. 012002-(1-13) [SJR: 0.21]
    more >>
  39. 57. Brody D., Hughston L., Meier D.M. Fragile entanglement statistics // Journal of Physics A: Mathematical and Theoretical - 2015, Vol. 48, No. 42, pp. 425301 [IF: 1.865, SJR: 0.787]
    more >>
  40. 56. Brody D., Law Y. Pricing of Defaultable Bonds with Random Information Flow // Applied Mathematical Finance - 2015, Vol. 22, No. 5, pp. 399-420 [SJR: 0.829]
    more >>
  41. 55. Brody D., Meier D.M. Elementary solution to the time-independent quantum navigation problem // Journal of Physics A: Mathematical and Theoretical - 2015, Vol. 48, No. 5, pp. 055302-(1-9) [IF: 1.865, SJR: 0.787]
    more >>
  42. 54. Brody D., Meier D.M. Solution to the Quantum Zermelo Navigation Problem // Physical Review Letters - 2015, Vol. 114, No. 10, pp. 100502-(1-5) [IF: 8.462, SJR: 3.688]
    more >>
  43. 53. Granichin O.N., Granichina O., Trapitsin S. Randomized stochastic approximation under unknown but bounded external noise and it's application to a control of educational processes // IFAC Proceedings Volumes (IFAC-PapersOnline) - 2015, Vol. 48, No. 11, pp. 378-383
    more >>
  44. 52. Hokkanen M.J., Lehto R., Takalo J., Salmela J., Haavisto S., Bykov A.V., Myllyla R., Timonen J., Ahlskog M. Depletion of carbon nanotube depositions and tube realignment in the spreading of sessile drops // Colloids and Surfaces A: Physicochemical and Engineering Aspects - 2015, Vol. 482, pp. 624–630 [IF: 2.714, SJR: 0.762]
    more >>
  45. 51. Lyashchenko K.N., Andreev O.Y. Importance of the Breit interaction for calculation of the differential cross section for dielectronic recombination with one-electron uranium // Physical Review A - 2015, Vol. 91, No. 1, pp. 012511(1-9) [IF: 2.925, SJR: 1.391]
    more >>
  46. 50. Maltsev I.A., Shabaev V.M., Tupitsyn I.I., Bondarev A.I., Kozhedub Y.S., Plunien G., Stohlker T. Electron-positron pair creation in low-energy collisions of heavy bare nuclei // Physical Review A - 2015, Vol. 91, No. 3, pp. 032708(1-7) [IF: 2.925, SJR: 1.391]
    more >>
  47. 49. Milov I.D., Abarenkov I.V., Tupitsyn I.I. Application of the embedding potential method in calculations of the electronic structure and X-ray emission spectra of crystal MgO clusters // Optics and spectroscopy - 2015, Vol. 118, No. 4, pp. 519-528 [IF: 0.716, SJR: 0.283]
    more >>
  48. 48. Minonzio J.G., Foiret J., Moilanen P., Pirhonen J., Zhao Z., Talmant M., Timonen J.T., Laugier P. A free plate model can predict guided modes propagating in tubular bone-mimicking phantoms // Journal of the Acoustical Society of America - 2015, Vol. 137, No. 1, pp. EL98-EL104 [IF: 1.547, SJR: 0.619]
    more >>
  49. 47. Mironova D.V., Tupitsyn I.I., Shabaev V.B., Plunien G. Relativistic calculations of the ground state energies and the critical distances for one-electron homonuclear quasi-molecules // Chemical Physics - 2015, Vol. 449, pp. 10-13 [IF: 1.767, SJR: 0.494]
    more >>
  50. 46. Myllys M., Hakkanen H.J., Korppi-Tommola J.E., Backfolk K.A., Sirvio P., Timonen J.T. X-ray microtomography and laser ablation in the analysis of ink distribution in coated paper // Journal of Applied Physics - 2015, Vol. 117, No. 14, pp. 144902 [IF: 2.068, SJR: 0.699]
    more >>
  51. 45. Parsegov S.E., Proskurnikov A.V., Tempo R., Friedkin N.E. A new model of opinion dynamics for social actors with multiple interdependent attitudes and prejudices // Proceedings of the IEEE Conference on Decision and Control (CDC) - 2015, pp. 3475-3480 [SJR: 0.395]
    more >>
  52. 44. Proskurnikov A.V. A new extension of the infinite-dimensional KYP lemma in the coercive case // IFAC Proceedings Volumes (IFAC-PapersOnline) - 2015, Vol. 48, No. 11, pp. 246-251
    more >>
  53. 43. Proskurnikov A.V. Consensus in nonlinear stationary networks with identical agents // Automation and Remote Control - 2015, Vol. 76, No. 9, pp. 1551-1565 [IF: 0.492, SJR: 0.331]
    more >>
  54. 42. Proskurnikov A.V. The Yakubovich quadratic criterion, F-stability and multi-agent consensus // IFAC Proceedings Volumes (IFAC-PapersOnline) - 2015, Vol. 48, No. 11, pp. 414-419
    more >>
  55. 41. Proskurnikov A.V. Universal controllers of V.A. Yakubovich: a systematic approach to LQR problems with uncertain external signals // IFAC Proceedings Volumes (IFAC-PapersOnline) - 2015, Vol. 48, No. 11, pp. 557-562
    more >>
  56. 40. Proskurnikov A.V., Cao M. Event-based Synchronization in Biology: Dynamics of Pulse Coupled Oscillators // Proceedings of 1st International Conference on Event-Based Control, Communication and Signal Processing, EBCCSP 2015 - 2015, pp. 1-6 [SJR: 0.236]
    more >>
  57. 39. Reshetikhin N., Stockman J., Vlaar B. Boundary quantum Knizhnik-Zamolodchikov equations and Bethe Vectors // Communications in Mathematical Physics - 2015, Vol. 336, No. 2, pp. 953-986 [IF: 2.5, SJR: 1.662]
    more >>
  58. 38. Reshetikhin N.Y., Vertman B. Combinatorial Quantum Field Theory and Gluing Formula for Determinants // Letters in Mathematical Physics - 2015, Vol. 105, No. 3, pp. 309-340 [IF: 1.671, SJR: 0.915]
    more >>
  59. 37. Riikila T.I., Tallinen T., Astrom J., Timonen J.T. A discrete-element model for viscoelastic deformation and fracture of glacial ice // Computer Physics Communications - 2015, Vol. 195, pp. 14–22 [IF: 3.936, SJR: 1.319]
    more >>
  60. 36. Smirnova V., Proskurnikov A.V., Utina N.V. Cycle slipping in nonlinear circuits under periodic nonlinearities and time delays // Proceedings - IEEE International Symposium on Circuits and Systems - 2015, pp. 3084-3087 [SJR: 0.229]
    more >>
  61. 35. Smirnova V.B., Pak E.E., Proskurnikov A.V., Utina N.V. Asymptotic properties of nonlinear singularly perturbed volterra equations // IFAC Proceedings Volumes (IFAC-PapersOnline) - 2015, Vol. 48, No. 11, pp. 604-609
    more >>
  62. 34. Amelina N.O., Granichin O.N., Granichina O., Jiang Y. Differentiated consensuses in decentralized load balancing problem with randomized topology, noise, and delays // Proceedings of the IEEE Conference on Decision and Control (CDC) - 2014, pp. 6969-6974 [SJR: 0.395]
    more >>
  63. 33. Bogolyubov N. Combinatorics of a strongly coupled boson system // Theoretical and Mathematical Physics - 2014, Vol. 181, No. 1, pp. 1132-1144 [IF: 0.984, SJR: 0.416]
    more >>
  64. 32. Cattaneo A.S., Mnev P.N., Reshetikhin N.Y. Classical BV theories on manifolds with boundary // Communications in Mathematical Physics - 2014, Vol. 332, No. 2, pp. 535 - 603 [IF: 2.5, SJR: 1.662]
    more >>
  65. 31. Chen Q., Reshetikhin N.Y. Recursion formulas for HOMFLY and Kauffman invariants // Journal of Knot Theory and its Ramifications - 2014, Vol. 23, No. 5, pp. 1450024 [IF: 0.363, SJR: 0.552]
    more >>
  66. 30. Pazgalev A.S., Sarkisyan D.H., Cartaleva S., Przhibelskii S.G., Vartanyan T.A. Ultra-narrow spectroscopic cells in atomic spectroscopy: reflection, transmission, fluorescence, and nonadiabatic transitions at the walls // Journal of Physics: Conference Series - 2014, Vol. 548, No. 1, pp. 012063-(1-4) [SJR: 0.21]
    more >>
  67. 29. Rybin A. Slow-light solitons: Influence of relaxation // Europhysics Letters - 2008, Vol. 81, No. 4, pp. 40009 pl1-pl4 [SJR: 0.625]
  68. 28. Rybin A. Slow-light solitons // J. Phys. A: Math. Theory - 2007, No. 40, pp. F135 - F141
  69. 27. Rybin A. Driving slow-light solitons by controlling laser field // J. Phys. A: Math. and General - 2005, No. 38, pp. L357 - L362
  70. 26. Rybin A. Nonlinear interaction of light with Bose-Einstein condensate: new methods to generate subpoissonian light // Physical Review A - 2005, Vol. 72, No. 1, pp. 013804 [IF: 2.925, SJR: 1.391]
    more >>
  71. 25. Rybin A. Stopping a slow-light soliton: an exact solution // J. Phys. A: Math. and General - 2005, No. 38, pp. L177 - L182
  72. 24. Rybin A. Theory of slow-light solitons // Phys. Rev. E - 2005, No. 72, pp. 026613 - 1 - 026613 - 13
  73. 23. Rybin A., Vadeiko I.P., Bishop A.R. Non-adiabatic manipulation of slow-light solitons // New Journal of Physics - 2005, Vol. 7, pp. 146 [IF: 3.786, SJR: 1.584]
    more >>
  74. 22. Rybin A. Collapse in the symmetric Gross-Pitaevskii Equation // Journal of Optics B: Quantum and Semiclassical Optics - 2004, No. 6, pp. 5392 - 5396
  75. 21. Rybin A. Manipulation of Optical Solitons in Bose-Einstein condensates // Journal of Optics B: Quantum and Semiclassical Optics - 2004, Vol. 6, No. 10, pp. 416 - 422
  76. 20. Rybin A. Singularity formation in the Gross-Pitaevskii Equation and Collapse in BEC // Phys. Rev. A - 2004, Vol. 69, No. 2, pp. 013677
  77. 19. Rybin A. Algebras of collective excitations and the Tavis-Cummings problem // Particles and Nuclei Letters - 2003, No. 116, pp. 83
  78. 18. Rybin A. Quantum integrable and nonintegrable nonlinear Schrödinger models for realizable Bose-Einstein condensation in d+1 dimensions (d=1,2,3) // Theor. Math. Physics - 2003, Vol. 134, No. 1, pp. 47 - 61
  79. 17. Vadeiko I.P., Miroshnichenko G.P., Rybin A., Timonen J.T. Algebraic approach to the Tavis-Cummings problem // Physical Review A - 2003, Vol. 67, No. 5, pp. 053808 [IF: 2.925, SJR: 1.391]
    more >>
  80. 16. Bullough R.K., Bogoliubov N.M., Rybin A., Varzugin G.G., Timonen J. Solitons of q-deformed quantum lattices and the quantum soliton // Journal of Physics A: Mathematical and General - 2001, Vol. 34, No. 48, pp. 10463-10474
    more >>
  81. 15. Rybin A., Timonen J., Varzugin G., Bullough R.K. Q-deformed solitons and quantum solitons of the Maxwell-Bloch lattice // Journal of Physics A: Mathematical and General - 2001, Vol. 34, No. 1, pp. 157-164
    more >>
  82. 14. Rybin A. Nonexponential dynamics and dynamics of the quasitrapping states in the N-atom micromaser http // JETP Letters - 2000, No. 72, pp. 449 [IF: 1.235, SJR: 0.574]
  83. 13. Rybin A. Similarity solutions and collapse in the attractive Gross-Pitaevskii equation // Phys. Rev. E - 2000, No. 62, pp. 6224
  84. 12. Rybin A., Miroshnichenko G.P., Vadeiko I.P., Timonen J.T. Multi-atom microlaser: a stable source of photons with subpoissonian statistics // Proceedings of SPIE - 2000, Vol. 4316, pp. 60-68 [SJR: 0.192]
    more >>
  85. 11. Vadeiko I.P., Miroshnichenko G.P., Timonen J.T., Rybin A. Diagonal invariance and quasi-trapped states in the micromaser model based on N-atom clusters // Optics and spectroscopy - 2000, Vol. 89, No. 2, pp. 300-307 [IF: 0.716, SJR: 0.283]
    more >>
  86. 10. Rybin A. The quantum dynamics of intensity-dependent Tavis-Cummings model // Journal of Physics A: Mathematical and General - 1999, No. 32, pp. 8739
  87. 9. Bogolyubov N., Rybin A., Bullough R.K., Timonen J.T. Maxwell-Bloch system on a lattice // Physical Review A - 1995, Vol. 52, No. 2, pp. 1487-1493 [IF: 2.925, SJR: 1.391]
    more >>
  88. 8. Bogoliubov N.M., Rybin A., Timonen J. An integrable q-deformed model for bosons interacting with spin impurities // Journal of Physics A: Mathematical and General - 1994, Vol. 27, No. 11, pp. L363-L367
    more >>
  89. 7. Kitaev A.V., Rybin A., Timonen J. Similarity solutions of the deformed Maxwell-Bloch system // Journal of Physics A: Mathematical and General - 1993, Vol. 26, No. 14, pp. 3583-3595
    more >>
  90. 6. Rybin A., Timonen J. Optical soliton in the presence of perturbations // Journal of Physics A: Mathematical and General - 1993, Vol. 26, No. 15, pp. 3869-3882
    more >>
  91. 5. Rybin A. Application of the Darboux transformation to spectral problems with variable spectral parameters // Journal of Physics A: Mathematical and General - 1991, Vol. 24, No. 22, pp. 5235
    more >>
  92. 4. Rybin A. Darboux transformations and coherent interaction of the light pulse with two level media // Inverse problems - 1988, No. 4, pp. 173
  93. 3. Rybin A. Exact integration of the Nonlinear Schredinger equation // Theoretical mathematical physics - 1988, No. 74, pp. 20
  94. 2. Rybin A. General solution of the reduced Maxwell-Bloch system // J. Sov. Math. (Zapiski Nauchnykh Seminarov LOMI) - 1988, No. 169, pp. 141
  95. 1. Rybin A. Solitons of the Korteweg-De Vries equation on the background of the known solution // Theoretical mathematical physics - 1985, No. 63, pp. 545