@article{PismaZhETF.3.494,
    title = {Mechanism of Summation of Electronic Excitations in Activated Crystals},
    author = {Ovsyankin, V. V. and Feofilov, P. P.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {3},
    issue = {12},
    pages = {494},
    year = {1966},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_24809.shtml},
}