@article{PismaZhETF.11.235,
    title = {Concerning a Bound Neutron in Matter},
    author = {Kagan, Yu.},
    journal = {Письма в ЖЭТФ},
    volume = {11},
    issue = {4},
    pages = {235},
    year = {1970},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_26100.shtml},
}