@article{MZM_2018_104_6_a7,
     author = {I. V. Mel'nikova and U. A. Alekseeva},
     title = {Semigroup {Classification} and {Gelfand--Shilov} {Classification} of {Systems} of {Partial} {Differential} {Equations}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {895--911},
     publisher = {mathdoc},
     volume = {104},
     number = {6},
     year = {2018},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2018_104_6_a7/}
}