@article{PismaZhETF.38.454,
    title = {Quantization of Hall conductivity},
    author = {Khmel'nitskii, D. E.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {38},
    issue = {9},
    pages = {454},
    year = {1983},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_22668.shtml},
}