@article{PismaZhETF.45.122,
    title = {Long-lived conjugate optical echo in a crystal},
    author = {Akhmediev, N. N. and Borisov, B. S. and Zultov, V. A. and Samartsev, V. V. and Stel'makh, M. F. and Fomichev, A. A. and Yakshin, M. A.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {45},
    issue = {3},
    pages = {122},
    year = {1987},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_18693.shtml},
}