@article{PismaZhETF.10.188,
    title = {New Geheration and Superradiance Lines of Lead Vapor},
    author = {Isaev, A. A. and Petrash, G. G.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {10},
    issue = {4},
    pages = {188},
    year = {1969},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_25715.shtml},
}