@article{PismaZhETF.33.459,
    title = {Observation of surface mechanical excitons in crystals},
    author = {Batyrev, A. S. and Novikov, B. V. and Cherednichenko, A. E.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {33},
    issue = {9},
    pages = {459},
    year = {1981},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_23056.shtml},
}