@article{PismaZhETF.10.495,
    title = {Gravitational Resonant Detector with Two Degrees of Freedom},
    author = {Lavrent'ev, G. Ya.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {10},
    issue = {10},
    pages = {495},
    year = {1969},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_25767.shtml},
}