@article{PismaZhETF.67.405,
    title = {The excitonic spectrum of germanium in a strong magnetic field},
    author = {Kravchenko, Yu. P. and Liberman, M. A.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {67},
    issue = {6},
    pages = {405},
    year = {1998},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_15205.shtml},
}