6. Z.S. Sacks, D. Rozas, G.A. Swartzlander Holografic formation of optical-vortex filament // Journ. Opt. Soc. Am. B15(8), pp.2226-2234 (1998). https://doi.org/10.1364/JOSAB.15.002226
7. L. Allen, M.W. Beijersbergen, R.J.C. Spreeuw, J.P. Woerdman Orbital angular momentum of light and the transformatiom of Laguerre-Gaussian laser modes // Physical Review A45(11), pp. 8185-8189 (1992). https://doi.org/10.1103/PhysRevA.45.8185
8. R.A. Beth Mechanical detection and measurement of the angular momentum of light // Physical Review 50, pp. 115-125(1936). https://doi.org/10.1103/PhysRev.50.115
9. H. He, M.E.J. Friese, N.R. Heckenberg, H. Rubinsztein-Dunlop Direct observation of transfer of angular momentum to absorptive particles from a laser beam with a phase singularity // Phys. Rev. Letters 75(5), pp.826-829 (1995). https://doi.org/10.1103/PhysRevLett.75.826
11. J.F. Nye, Polarization effects in the diffraction of electromagnetic waves: the role of disclinations // Proc. R. Soc. Lond. A387,pp. 105-132. (1983). https://doi.org/10.1098/rspa.1983.0053
12. J.F. Nye, Lines of circular polarization in electromagnetic wave fields // Proc. R. Soc. Lond. A 389, pp.279-290 (1983). https://doi.org/10.1098/rspa.1983.0109
13. J.F. Nye, J.V. Hajnal, The wave structure of monochromatic electromagnetic radiation // Proc. R. Soc. Lond. A 409, pp.21-36 (1987). https://doi.org/10.1098/rspa.1987.0002
14. N.B. Baranova, B.Ya. Zel'dovich Wavefront dislocations and amplitude zeros // Exp. and Theor. Phys. Journ. 80, pp. 1789-1794 (1981) (Rush).
16. M.Ya. Darsht, B.Ya. Zel'dovich, I.V.Kotievsky, N.L. Kundikova. Wave front single dislocation formation // Journ.Theor. and Exp. Phys.107(5), pp.1467-1472, (1995. ) (Rush).
17. A.V. Volyar, T.A. Fadeyeva Mode vortex nature in an optical fiber: II. An optical vortex propagation // Techn. Phys. Journ. Lett.22(8), P. 63-67 (1996) (Rush).
18. A.V. Volyar, T.A. Fadeyeva Optics of singularities of a low-mode fiber: I. Circular disclinations // Optics and Spectroscopy 85(2), pp. 264-271 (1998).
19. A.V. Volyar, T.A. Fadeyeva Optics of singularities of a low-mode fiber: II. Optical vortices // Optics and Spectroscopy 85(2), pp. 272-280 (1998).
20. K.N. Alexeyev, T.A. Fadeyeva, A.V. Volyar, M.S. Soskin, Optical vortices and the flow of their angular momentum in a multimode fiber // Semiconductor Physics. Quantum Electronics & Optoelectronics 1(1), pp. 1-8 (1998). https://doi.org/10.15407/spqeo1.01.082
21. C.N. Alexeyev, Yu.A. Fridman, A.N. Alexeyev, Angular momentum and spin-orbit interaction in weakly guiding fibers // Ukr. Fiz. Zh., 44(6), pp. 74-81 (1999).
22. A.V. Volyar, T.A. Fadeyeva Optical vortices in low-mode fiber: 1. Angular momentum of field // Optics and Spectroscopy 86(2), pp.242-250. (1999).
23. V.S. Liberman, B.Ya. Zel'dovich, Spin-orbit interaction of a photon in an inhomogeneous medium // Phys. Rev. A45(8),pp. 5199-5207 (1992). https://doi.org/10.1103/PhysRevA.46.5199
24. A.V. Volyar, V.Z. Zhilaitis, V.G. Shvedov Optical eddies in small-mode fibers: 2. The spin-orbit interaction // Optics and Spectroscopy, 86(4), pp. 664-670. (1999).
25. A.V. Volyar, V.Z. Zhilaitis, V.G. Shvedov, M.S. Soskin, T.A. Fadeyeva, Topological birefringence of optical vortices in an inhomogeneous media // Optics of Atmosphere and Ocean 11(11), pp. 1199-1214 (1998) (Rush).
33. M.W. Beijersbergen, L. Allen, van der Veen H.E.L.O., J.P.Woerdman, Astigmatic laser mode converters and transfer of orbital angular momentum // Opt. Comm. 196, pp. 123-132.(1993). https://doi.org/10.1016/0030-4018(93)90535-D
34. J.F. Nye, Natural Focusing and Fine Structure of Light, Institute of Physics Publishing Bristol and Philadelphia, (1999).