@article{PismaZhETF.61.733,
    title = {Energy spectrum of narrow-gap semiconductor heterostructures  described by a two-band equation},
    author = {Kolesnikov, A. V. and Silin, A. P.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {61},
    issue = {9},
    pages = {733},
    year = {1995},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_18261.shtml},
}