@article{PismaZhETF.30.565,
    title = {Piezoelectric effect in $Cu_{0.5}ln_{0.5}Cr_2S_4$ and $xCuCr_3S_4-(1-x)Cu_{0.5}Cr_2S_4$ compounds with a normal spinel structure},
    author = {Tsvetkova, N. A. and Belov, K. P. and Koroleva, L. I. and Titov, V. V. and Kesler, Ya. A. and Gordeav, I. V.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {30},
    issue = {9},
    pages = {565},
    year = {1979},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_20695.shtml},
}