@article{PismaZhETF.21.578,
    title = {Effect of condensed phase of excitons on the absorption of ultrasound in germanium},
    author = {Alekseev, A. S. and Galkina, T. I. and Maslennikov, V. N. and Khakimov, R. G. and Shebnev, E. P.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {21},
    issue = {10},
    pages = {578},
    year = {1975},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_22492.shtml},
}