@article{PismaZhETF.41.9,
    title = {Change in the shape of a weak, ultrashort light pulse passing through a medium with a population inversion and a slow phase relaxation},
    author = {Varnavskii, O. P. and Golovlev, V. V. and Kirkin, A. N. and Mozharovskii, A. M.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {41},
    issue = {1},
    pages = {9},
    year = {1985},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_21899.shtml},
}