@article{PismaZhETF.9.40,
    title = {Observation of Ultracold Neutrons.},
    author = {Lushchikov, V. I. and Pokotilovskii, Yu. N. and Strelkov, A. V. and Shapiro, F. L.},
    journal = {Письма в ЖЭТФ},
    volume = {9},
    issue = {1},
    pages = {40},
    year = {1969},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_25024.shtml},
}