@article{PismaZhETF.32.285,
    title = {Critical electric fields and currents of two-dimensional systems},
    author = {Burkov, S. E. and Pokrovskii, V. L.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {32},
    issue = {4},
    pages = {285},
    year = {1980},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_21689.shtml},
}