@article{PismaZhETF.30.244,
    title = {Polaritons in thin semiconducting films},
    author = {Keldysh, L. V.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {30},
    issue = {4},
    pages = {244},
    year = {1979},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_20628.shtml},
}