@article{PismaZhETF.39.540,
    title = {Threshold generation of harmonics in the microwave range in bismuth},
    author = {Vitkalov, S. A. and Gantmakher, V. F. and Leviev, G. I.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {39},
    issue = {12},
    pages = {540},
    year = {1984},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_19702.shtml},
}