@article{DAN_1972_202_2_a0,
     author = {G. R. Belitskii},
     title = {Functional equations and conjugacy of local diffeomorphisms of finite smoothness class},
     journal = {Doklady Akademii Nauk},
     pages = {255--258},
     publisher = {mathdoc},
     volume = {202},
     number = {2},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1972_202_2_a0/}
}