@article{PismaZhETF.33.493,
    title = {Absolute calibration of the sensitivity of photodetectors using a biphotonic field},
    author = {Malygin, A. A. and Penin, A. N. and Sergienko, A. V.},
    journal = {Письма в ЖЭТФ},
    volume = {33},
    issue = {10},
    pages = {493},
    year = {1981},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_23064.shtml},
}