@article{PismaZhETF.5.6,
    title = {Absorption of Sound in Single-crystal $NH_4Cl$ during Its Phase Transformation},
    author = {Shustin, O. A. and Yakovlev, I. A. and Velichkina, T. S.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {5},
    issue = {1},
    pages = {6},
    year = {1967},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_25080.shtml},
}