@article{PismaZhETF.48.585,
    title = {Observation of a long-lived multiple optical echo},
    author = {Akhmediev, N. N. and Borisov, B. S. and Zuikov, V. A. and Samartsev, V. V. and Stel'makh, M. F. and Usmanov, R. G. and Fomichev, A. A. and Yakshin, M. A.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {48},
    issue = {11},
    pages = {585},
    year = {1988},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_16800.shtml},
}