@article{PismaZhETF.5.202,
    title = {Concerning the Nature of the $A_1$ Resonance},
    author = {Babichev, N. B. and Zhizhin, E. D. and Nikitin, Yu. P.},
    journal = {Письма в ЖЭТФ},
    volume = {5},
    issue = {6},
    pages = {202},
    year = {1967},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_25141.shtml},
}