@article{PismaZhETF.23.679,
    title = {Isotopic shift of exciton lines in the absorption spectrum of $Cu_2O$},
    author = {Kreingol'd, F. I. and Lider, K. F. and Solov'ev, L. E.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {23},
    issue = {12},
    pages = {679},
    year = {1976},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_27610.shtml},
}