@article{IM2_1977_11_6_a4,
     author = {B. S. Mityagin and E. M. Semenov},
     title = {Lack of interpolation of linear operators in spaces of smooth functions},
     journal = {Izvestiya. Mathematics },
     pages = {1229--1266},
     publisher = {mathdoc},
     volume = {11},
     number = {6},
     year = {1977},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1977_11_6_a4/}
}