@article{PismaZhETF.9.415,
    title = {Condensation of Exciton Gas in Germanium},
    author = {Asnin, Y. M. and Rogachev, A. A.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {9},
    issue = {7},
    pages = {415},
    year = {1969},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_25377.shtml},
}