@article{PismaZhETF.53.93,
    title = {Anomalous temperature dependence of the first critical field of a ceramic high-$T_c$ superconductor},
    author = {Baranov, M. A. and Gorbachev, V. S. and Senatorov, A. V.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {53},
    issue = {2},
    pages = {93},
    year = {1991},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_17363.shtml},
}