@article{PismaZhETF.47.283,
    title = {Three-loop $\beta$ function of the Wess-Zumino-Witten model},
    author = {Ketov, S. V.},
    journal = {Письма в ЖЭТФ},
    volume = {47},
    issue = {6},
    pages = {283},
    year = {1988},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_16504.shtml},
}