@article{PismaZhETF.56.455,
    title = {Self-focusing and defocusing of electromagnetic-wave beams in the case of a thermal nonlinearity},
    author = {Fedorov, M. A.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {56},
    issue = {9},
    pages = {455},
    year = {1992},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_19518.shtml},
}