@article{PismaZhETF.29.272,
    title = {Optical synchronous detection},
    author = {Tychinskii, V. P.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {29},
    issue = {5},
    pages = {272},
    year = {1979},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_22073.shtml},
}