@article{PismaZhETF.10.49,
    title = {Magnetic Surface Levels in Superconductors},
    author = {Azbel, M. Ya. and Blank, A. Ya.},
    journal = {Письма в ЖЭТФ},
    volume = {10},
    issue = {1},
    pages = {49},
    year = {1969},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_25680.shtml},
}