@article{PismaZhETF.22.328,
    title = {Collective modes of a system of electrons on a helium surface},
    author = {Shikin, V. B.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {22},
    issue = {6},
    pages = {328},
    year = {1975},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_23332.shtml},
}