@article{PismaZhETF.47.276,
    title = {Effect of isotopic substitution of copper on the critical temperature of the superconducting ceramic $Y_1Ba_2Cu_3O_7$},
    author = {Vasil'ev, B. V. and Lushchikov, V. I. and Sikolenko, V. V.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {47},
    issue = {5},
    pages = {276},
    year = {1988},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_16428.shtml},
}