@article{PismaZhETF.46.122,
    title = {Electronic excitations and luminescence of $Y_1Ba_2Cu_30_7$ superconducting metal-insulator ceramics},
    author = {Lushchik, Ch. B and Kuusmann, I. L and Fel'dbakh, E. Kh. and Vallaste, K. E. and Liblik, P. Kh. and Maaroos, A. A. and Meriloo, I. A. and Savikhina, T. I.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {46},
    issue = {3},
    pages = {122},
    year = {1987},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_18526.shtml},
}