@article{PismaZhETF.34.125,
    title = {Observation of a hot-hole population inversion in germanium},
    author = {Vorob'ev, L. E. and Osokin, F. I. and Stafeev, V. I. and Tulupenko, V. N.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {34},
    issue = {3},
    pages = {125},
    year = {1981},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_23146.shtml},
}