@article{PismaZhETF.17.147,
    title = {Population   Inversion  in   the  Active  Medium of an  Electroionization  $C0_2$ Laser  at   a Working-mixture  Pressure  up to 20 Atmospheres},
    author = {Basov, N. G. and Danilychev, V. A. and Kerimov, O. M. and Podsosonnyi, A. S.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {17},
    issue = {3},
    pages = {147},
    year = {1973},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_23481.shtml},
}