@article{PismaZhETF.10.219,
    title = {Lifetimes of Free and Bound Excitons in $CuO_2$ Crystals.},
    author = {Gross, E. F. and Kreingol'd, F. I.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {10},
    issue = {5},
    pages = {219},
    year = {1969},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_25723.shtml},
}