@article{PismaZhETF.22.192,
    title = {Topologically nontrivial particles in quantum field theory},
    author = {Tyupkin, Yu. S. and Fateev, V. A. and Shvarts, A. S.},
    journal = {Письма в ЖЭТФ},
    volume = {22},
    issue = {3},
    pages = {192},
    year = {1975},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_23294.shtml},
}