@article{TMF_1989_78_1_a2,
     author = {V. I. Gromak and V. V. Tsegel'nik},
     title = {System of~three-wave resonant interaction and $P$-type equations},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {22--34},
     publisher = {mathdoc},
     volume = {78},
     number = {1},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1989_78_1_a2/}
}