@article{PismaZhETF.58.231,
    title = {On a time dependence of physical constants},
    author = {Varshalovich, D. A. and Levshakov, S. A.},
    journal = {Письма в ЖЭТФ},
    volume = {58},
    issue = {4},
    pages = {231},
    year = {1993},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_17908.shtml},
}