@article{PismaZhETF.34.28,
    title = {Electron-electron exchange in many-valley semiconductors and the fine structure of many-exciton complexes in silicon},
    author = {Pikus, G. E. and Averkiev, N. S.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {34},
    issue = {1},
    pages = {28},
    year = {1981},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_23122.shtml},
}