@article{PismaZhETF.48.166,
    title = {Dependence of the phonon state density of the ceramic $YBa_2Cu_3_x$ on the oxygen concentration and temperature},
    author = {Natkanets, I. and Belushkin, A. V. and Goremychkin, E. A. and Mater, Ya. and Sashin, I. L. and Fedotov, V. K. and Nikolaev, R. K. and Ponyatovskii, E. G. and Sidorov, N. S.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {48},
    issue = {3},
    pages = {166},
    year = {1988},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_16671.shtml},
}