@article{PismaZhETF.22.207,
    title = {Absorption spectra in electron transitions between excited states of impurities in germanium},
    author = {Gershenzon, E. M. and Orlov, L. A. and Ptitsina, N. G.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {22},
    issue = {4},
    pages = {207},
    year = {1975},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_23299.shtml},
}