@article{PismaZhETF.1.28,
    title = {"Shadow universe" and the neutrino experiment},
    author = {Okun', L. B. and Pomeranchuk, I. Ya.},
    journal = {Письма в ЖЭТФ},
    volume = {1},
    issue = {6},
    pages = {28},
    year = {1965},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_24439.shtml},
}