@article{PismaZhETF.51.124,
    title = {Emission of electron-hole droplets or lasing action in germanium crystals},
    author = {Kipen', A. A.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {51},
    issue = {3},
    pages = {124},
    year = {1990},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_17203.shtml},
}