@article{PismaZhETF.13.332,
    title = {Observation of Excited States and Experimental Determination of the Binding Energy of Indirect Exciton in Germanium},
    author = {Gross, E. F. and Safarov, V. I. and Titkov, A. N. and Shlimak, I. S.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {13},
    issue = {7},
    pages = {332},
    year = {1971},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_24230.shtml},
}