@article{PismaZhETF.13.395,
    title = {Self-focusing of Powerful Sound During the Production of Bubbles},
    author = {Askar'yan, G. A.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {13},
    issue = {7},
    pages = {395},
    year = {1971},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_24281.shtml},
}