@article{PismaZhETF.44.493,
    title = {Observation of the process $e^+e^--\gamma\gamma\gamma\gamma$},
    author = {Vasserman, I. B. and Golubev, V. B. and Dolinskii, S. I. and Druzhinin, V. P. and Dubrovin, M. S. and Ivanchenko, V. N. and Pakhtusova, E. V. and Peryshkin, A. N. and Serednyakov, S. I and Sidorov, V. A. and Usov, Yu. V. and Shatunov, Yu. M.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {44},
    issue = {11},
    pages = {493},
    year = {1986},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_21199.shtml},
}