@article{DAN_1976_228_3_a6,
     author = {B. S. Mityagin and E. M. Semenov},
     title = {$C^k$ is not an interpolation space between $C$ and $C^n$, $0<k<n$},
     journal = {Doklady Akademii Nauk},
     pages = {543--546},
     publisher = {mathdoc},
     volume = {228},
     number = {3},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1976_228_3_a6/}
}