@article{PismaZhETF.5.399,
    title = {Visual Observation of Second Sound by the Toepler Method},
    author = {Gulyaev, A. I.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {5},
    issue = {11},
    pages = {399},
    year = {1967},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_25211.shtml},
}