@article{PismaZhETF.31.654,
    title = {Reversed light echo in a ruby},
    author = {Zuikov, V. A. and Samartsev, V. V. and Usmanov, R. G},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {31},
    issue = {11},
    pages = {654},
    year = {1980},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_20502.shtml},
}