@article{PFMT_2016_4_a4,
     author = {P. A. Khilo and N. A. Khilo and O. I. Pronevich},
     title = {Generation of {Bessel} light beams of the second harmonic in crystals with radial-periodically nonlinearity},
     journal = {Problemy fiziki, matematiki i tehniki},
     pages = {31--34},
     year = {2016},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/PFMT_2016_4_a4/}
}