@article{PismaZhETF.5.288,
    title = {Sound in a Degenerate Solution of $He^3$ in Superfluid Helium},
    author = {Khalatnikov, I. M.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {5},
    issue = {8},
    pages = {288},
    year = {1967},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_25172.shtml},
}