@article{PismaZhETF.15.66,
    title = {New Method of Amplifying Monochromatic Ultrasound in a Semimetal},
    author = {Rakhmanov, S. Ya.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {15},
    issue = {1},
    pages = {66},
    year = {1972},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_26489.shtml},
}