@article{PismaZhETF.9.420,
    title = {Lifetime of Neutral Pion},
    author = {Kryshkin, V. I. and Sterligov, A. G. and Usov, Yu. R.},
    journal = {Письма в ЖЭТФ},
    volume = {9},
    issue = {7},
    pages = {420},
    year = {1969},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_25378.shtml},
}