@article{PismaZhETF.21.94,
    title = {Concerning the existence of monopoles in gauge field theories},
    author = {Monastyrskii, M. I. and Perelomov, A. M.},
    journal = {Письма в ЖЭТФ},
    volume = {21},
    issue = {1},
    pages = {94},
    year = {1975},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_22241.shtml},
}