@article{PismaZhETF.65.590,
    title = {Grand unification and heavy axion},
    author = {Rubakov, V. A.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {65},
    issue = {8},
    pages = {590},
    year = {1997},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_15257.shtml},
}