@article{DAN_1994_339_4_a9,
     author = {O. A. Aktsipetrov and A. V. Mel'nikov and T. V. Murzina and A. A. Nikulin and A. N. Rubtsov},
     title = {On the nature of the optical second harmonic generation},
     journal = {Doklady Akademii Nauk},
     pages = {468--471},
     year = {1994},
     volume = {339},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1994_339_4_a9/}
}