@article{PismaZhETF.18.145,
    title = {Energy spectrum of disordered three-dimensional system},
    author = {Ovchinnikov, A. A.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {18},
    issue = {2},
    pages = {145},
    year = {1973},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_23904.shtml},
}