@article{PismaZhETF.53.437,
    title = {Quadratic optical nonlinearity of an amorphous heterojunction},
    author = {Agapov, A. Yu. and Zhitkov, P. M. and Favstov, V. G. and Shevtsov, V. M.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {53},
    issue = {9},
    pages = {437},
    year = {1991},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_17620.shtml},
}