@article{PismaZhETF.6.655,
    title = {Self-focusing of Intense Light Beams},
    author = {Dyshko, A. L. and Lugovoi, V. N. and Prokhorov, A. M.},
    journal = {Письма в ЖЭТФ},
    volume = {6},
    issue = {5},
    pages = {655},
    year = {1967},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_25448.shtml},
}