@article{PismaZhETF.40.369,
    title = {Harmonic generation without phase matching},
    author = {Belenov, E. M. and Nazarkin, A. V.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {40},
    issue = {9},
    pages = {369},
    year = {1984},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_19055.shtml},
}