@article{PismaZhETF.14.289,
    title = {Spectrum of Collective Excitations in Liquid $^4'$He},
    author = {Sysoev, V. M.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {14},
    issue = {5},
    pages = {289},
    year = {1971},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_24884.shtml},
}