@article{PismaZhETF.61.887,
    title = {Optical pulse collapse in defocusing active medium},
    author = {Kramer, L. and Kuznetsov, E. A. and Popp, S. and Turitsyn, S. K.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {61},
    issue = {11},
    pages = {887},
    year = {1995},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_18287.shtml},
}