@article{SM_1973_20_4_a6,
     author = {G. R. Belitskii},
     title = {Functional equations and local conjugacy of mappings of class~$C^\infty$},
     journal = {Sbornik. Mathematics},
     pages = {587--602},
     publisher = {mathdoc},
     volume = {20},
     number = {4},
     year = {1973},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1973_20_4_a6/}
}