@article{PismaZhETF.27.656,
    title = {Observation of the "freezing" of an ultrasonic wave},
    author = {Arakelyan, V. S. and Avetisyan, A. G. and Mirzabekyan, E. G. and Shaverdyan, F. M.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {27},
    issue = {11},
    pages = {656},
    year = {1978},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_23796.shtml},
}