@article{PismaZhETF.19.168,
    title = {Contribution to the theory of band ferromagnetism},
    author = {Volkov, B. A. and Kopaev, Yu. V.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {19},
    issue = {3},
    pages = {168},
    year = {1974},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_26974.shtml},
}