@article{IM2_1977_11_5_a4,
     author = {G. R. Belitskii},
     title = {Normal forms relative to the action of a~group on a~space},
     journal = {Izvestiya. Mathematics },
     pages = {1001--1010},
     publisher = {mathdoc},
     volume = {11},
     number = {5},
     year = {1977},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1977_11_5_a4/}
}