@article{PismaZhETF.53.69,
    title = {Observation of intensified forward $\gamma$-ray emission in spontaneous nuclear decay},
    author = {Shvyd'ko, Yu. V. and Smirnov, G. V. and Popov, S. L. and Hertrich, T.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {53},
    issue = {2},
    pages = {69},
    year = {1991},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_17356.shtml},
}