@article{PismaZhETF.6.807,
    title = {Frequency Spectrum of Self-focusing Light Pulses},
    author = {Ostrovskii, L. A.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {6},
    issue = {8},
    pages = {807},
    year = {1967},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_25496.shtml},
}