@article{PismaZhETF.6.556,
    title = {Quartz Resonator with Q Close to 120 $\times 10^6$ at Temperature $2^\circ$ K},
    author = {Smagin, A. G. and Nikol'skaya, V. I.},
    journal = {Письма в ЖЭТФ},
    volume = {6},
    issue = {3},
    pages = {556},
    year = {1967},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_25264.shtml},
}