@article{FAA_1979_13_3_a2,
     author = {A. M. Lukatskii},
     title = {Curvature of groups of diffeomorphisms preserving the measure of the $2$-sphere},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {23--27},
     publisher = {mathdoc},
     volume = {13},
     number = {3},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1979_13_3_a2/}
}