@article{TMF_1982_51_1_a3,
     author = {B. A. Malomed},
     title = {Perturbation theory for the nonlinear {Schr\"odinger} equation in the solitonless sector},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {34--43},
     publisher = {mathdoc},
     volume = {51},
     number = {1},
     year = {1982},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1982_51_1_a3/}
}