@article{PismaZhETF.12.45,
    title = {Surface States in Semiconductors with Complicated Band Structure},
    author = {Chaplik, A. V. and Karpushin, A. A.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {12},
    issue = {1},
    pages = {45},
    year = {1970},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_26224.shtml},
}