@article{PismaZhETF.20.668,
    title = {Spectra of IV-VI semiconductors},
    author = {Gordyunin, S. A. and Gor'kov, L. P.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {20},
    issue = {10},
    pages = {668},
    year = {1974},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_27375.shtml},
}