@article{PismaZhETF.2.3,
    title = {Possible Existence of "Second" Spin Waves in Ferromagnets},
    author = {Gulayev, Yu. V.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {2},
    issue = {1},
    pages = {3},
    year = {1965},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_24442.shtml},
}