@article{PismaZhETF.11.300,
    title = {"Mixmaster Universe" and the Cold Variant},
    author = {Zel'dovich, Ya. B.},
    journal = {Письма в ЖЭТФ},
    volume = {11},
    issue = {6},
    pages = {300},
    year = {1970},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_26118.shtml},
}