@article{PismaZhETF.57.210,
    title = {The role of conduction band states in forming of electron negative-U centers},
    author = {Klinger, M. I. and Taraskin, S. N.},
    journal = {Письма в ЖЭТФ},
    volume = {57},
    issue = {4},
    pages = {210},
    year = {1993},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_17764.shtml},
}