@article{PismaZhETF.9.242,
    title = {Nature of the Amplification of the NMR Signal of the $Fe^{57}$ in Hematite Crystals},
    author = {Zalesskii, A. V. and Zheludev, S. and Voskanyan, R. A.},
    journal = {Письма в ЖЭТФ},
    volume = {9},
    issue = {4},
    pages = {242},
    year = {1969},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_25318.shtml},
}