@article{DAN_1963_148_1_a6,
     author = {S. P. Novikov},
     title = {Homotopy properties of the group of diffeomorphisms of the sphere},
     journal = {Doklady Akademii Nauk},
     pages = {32--35},
     publisher = {mathdoc},
     volume = {148},
     number = {1},
     year = {1963},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1963_148_1_a6/}
}