@article{TMF_1987_72_2_a2,
     author = {N. N. Akhmediev and V. M. Eleonskii and N. E. Kulagin},
     title = {Exact first-order solutions of the nonlinear {Schr\"odinger} equation},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {183--196},
     publisher = {mathdoc},
     volume = {72},
     number = {2},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1987_72_2_a2/}
}