@article{PismaZhETF.12.443,
    title = {Partifcle Production in Cosmology},
    author = {Zel'dovich, Ya. B.},
    journal = {Письма в ЖЭТФ},
    volume = {12},
    issue = {9},
    pages = {443},
    year = {1970},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_26352.shtml},
}