@article{PismaZhETF.27.185,
    title = {Active spectroscopy of noncentrosymmetric crystals under conditions of double $\omega-k$ resonance},
    author = {Sukhodol'skii, A. T.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {27},
    issue = {3},
    pages = {185},
    year = {1978},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_23671.shtml},
}