@article{PismaZhETF.42.145,
    title = {Two-dimensional massless electrons in an inverted contact},
    author = {Volkov, B. A. and Pankratov, O. A.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {42},
    issue = {4},
    pages = {145},
    year = {1985},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_21570.shtml},
}