@article{PismaZhETF.9.192,
    title = {Bending of Surface and Self-focusfng of a Laser Beam in a Linear Medium},
    author = {Kats, A. V. and Kontorovich, V. A.},
    journal = {Письма в ЖЭТФ},
    volume = {9},
    issue = {3},
    pages = {192},
    year = {1969},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_25305.shtml},
}