@article{PismaZhETF.21.118,
    title = {Crystal stability and band structure},
    author = {Al'tshuler, A. and Vekilov, Yu. Kh. and Umarov, G. R.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {21},
    issue = {2},
    pages = {118},
    year = {1975},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_22263.shtml},
}