@article{PismaZhETF.30.175,
    title = {Doppler-free spectroscopy and wave front rotation in the parametric interaction of nonmonochromatic waves},
    author = {Popov, A. K. and Shalaev, V. M.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {30},
    issue = {3},
    pages = {175},
    year = {1979},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_20610.shtml},
}