@article{PismaZhETF.19.672,
    title = {Parametric excitation of second sound by first sound in liquid helium II},
    author = {Pushkina, N. I. and Khokhlov, R. V.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {19},
    issue = {11},
    pages = {672},
    year = {1974},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_27118.shtml},
}