Semiclassical description of undulator radiation / A. A. Shishmarev, A. D. Levin, V. G. Bagrov, D. M. Gitman // Journal of experimental and theoretical physics. 2021. Vol. 132, № 2. P. 247-256. URL: http://vital.lib.tsu.ru/vital/access/manager/Repository/koha:000894849