Blonskyi, I. V., V. M. Kadan, A. A. Dergachev, S. A. Shlenov, V. P. Kandidov, V. M. Puzikov, and L. O. Grin’. “Filamentation of Femtosecond Vortex Beam in Sapphire”. Ukrainian Journal of Physics 58, no. 4 (October 6, 2018): 341. Accessed November 22, 2024. https://ujp.bitp.kiev.ua/index.php/ujp/article/view/2018300.