@article{TMF_1980_44_2_a7,
     author = {E. I. Shulman},
     title = {Existence of~a~countable set of~integrals of~the motion for a~system of~three three-dimensional wave packets with resonance interaction},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {224--228},
     publisher = {mathdoc},
     volume = {44},
     number = {2},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1980_44_2_a7/}
}