@article{PismaZhETF.11.454,
    title = {Concerning the Problem of the $A_2$ Meson},
    author = {Khalfin, L. A.},
    journal = {Письма в ЖЭТФ},
    volume = {11},
    issue = {9},
    pages = {454},
    year = {1970},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_26164.shtml},
}