@article{PismaZhETF.45.439,
    title = {Universality of helium},
    author = {Dyugaev, A. M.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {45},
    issue = {9},
    pages = {439},
    year = {1987},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_18818.shtml},
}