@article{DAN_1997_352_1_a1,
     author = {I. V. Belyakov and A. M. Stepin},
     title = {The extremal property of multidimensional {Chebyshev} mappings},
     journal = {Doklady Akademii Nauk},
     pages = {11--14},
     publisher = {mathdoc},
     volume = {352},
     number = {1},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1997_352_1_a1/}
}