@article{PismaZhETF.31.156,
    title = {Thetons},
    author = {Okun', L. B.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {31},
    issue = {2},
    pages = {156},
    year = {1980},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_20264.shtml},
}