@article{PismaZhETF.49.563,
    title = {Long-lived stimulated echo in a superconducting $YBa_2Cu_3O_x$ powder},
    author = {Drobinin, A. V. and Tsipenyuk, Yu. M.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {49},
    issue = {10},
    pages = {563},
    year = {1989},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_16986.shtml},
}