@article{PismaZhETF.9.255,
    title = {Sound Absorption in Superfluid He near the $\lambda$ Point},
    author = {Pokrovskii, V. L. and Khalatnikov, I. M.},
    journal = {Письма в ЖЭТФ},
    volume = {9},
    issue = {4},
    pages = {255},
    year = {1969},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_25322.shtml},
}