@article{PismaZhETF.32.224,
    title = {Propagation of nonlinear waves of first sound in liquid helium},
    author = {Sibel'din, N. N. and Stopachinskii, V. B. and Tsvetkov, V. A. and Etien, B.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {32},
    issue = {3},
    pages = {224},
    year = {1980},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_21674.shtml},
}