@article{TMF_1997_112_1_a8,
     author = {D. D. Tskhakaya and E. I. Shulman},
     title = {On degenerate multidimensional dispersion laws},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {124--131},
     year = {1997},
     volume = {112},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1997_112_1_a8/}
}