@article{DAN_1987_295_3_a21,
     author = {A. D. Novikov and S. G. Odulov and M. S. Soskin},
     title = {Frequency-degenerate optical oscillation due to the forward
},
     journal = {Doklady Akademii Nauk},
     pages = {596--600},
     publisher = {mathdoc},
     volume = {295},
     number = {3},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1987_295_3_a21/}
}