2. M. S. Soskin, M.V.Vasnetsov, Singular optics as a New Chapter of Modern Photonics: Optical Vortices Fundamentals and Applications // Photonics Science News 4(4) pp. 21-42 (1999).
3. Galina Machavariani, Nir Davidson, Erez Hasman, Shmuel Blit, Amiel A. Ishaaya, Asher A. Friesem, Efficient conversion of Gaussian beam to high purity helical beam // Optics Comunications 209, pp. 265-271 (2002). https://doi.org/10.1016/S0030-4018(02)01683-8
4. V. Yu. Bazhenov, M.V.Vasnetsov and M. S. Soskin, Laser beams with screw dislocations in their wavefronts // JETP Lett., 52pp. 429-431 (1990).
5. B. N. Kotletzov, Microimaging: optical methods for design and inspection, p. 15 L. Mashinostroenie, (1985) (in Rus).
8. M.V.Vasnetsov, V.V. Slyusar, M. S. Soskin, Mode separator for a beam with an off-axis optical vortex, Quant. Electron.31, pp. 464-466 (2001). https://doi.org/10.1070/QE2001v031n05ABEH001980
9. I. V. Basistiy, M. S. Soskin, M. V. Vasnetsov, Optical wavefront dislocations and their properties Optics Comunications 119,pp. 604-612 (1995). https://doi.org/10.1016/0030-4018(95)00267-C