@article{PismaZhETF.35.187,
    title = {Bound states of an electron at a small-radius center in a magnetic field},
    author = {Andreev, S. P. and Koshelkin, A. V.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {35},
    issue = {5},
    pages = {187},
    year = {1982},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_19869.shtml},
}