@article{PismaZhETF.33.658,
    title = {Superheavy magnetic monopoles and decay of the proton},
    author = {Rubakov, V. A.},
    journal = {Письма в ЖЭТФ},
    volume = {33},
    issue = {12},
    pages = {658},
    year = {1981},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_23107.shtml},
}