@article{PismaZhETF.32.27,
    title = {Generation of tunable radiation by impurity cholesteric liquid crystals},
    author = {ll'chishin, I. P. and Tikhonov, E. A. and Tishchenko, V. G. and Shpak, M. T.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {32},
    issue = {1},
    pages = {27},
    year = {1980},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_21623.shtml},
}