@article{MMO_1979_40_a0,
     author = {G. R. Belickiǐ},
     title = {Normal forms in relation to the filtering action of a~group},
     journal = {Trudy Moskovskogo matemati\v{c}eskogo ob\^{s}estva},
     pages = {3--46},
     publisher = {mathdoc},
     volume = {40},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MMO_1979_40_a0/}
}