@article{DAN_1967_175_2_a5,
     author = {Ch. Davis},
     title = {Properties of mappings of certain {Chebyshev} systems},
     journal = {Doklady Akademii Nauk},
     pages = {280--283},
     publisher = {mathdoc},
     volume = {175},
     number = {2},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1967_175_2_a5/}
}