Geodesic
Curvature of groups of diffeomorphisms preserving the measure of the $2$-sphere
Funkcionalʹnyj analiz i ego priloženiâ, Tome 13 (1979) no. 3, pp. 23-27 
A. M. Lukatskii. Curvature of groups of diffeomorphisms preserving the measure of the $2$-sphere. Funkcionalʹnyj analiz i ego priloženiâ, Tome 13 (1979) no. 3, pp. 23-27. http://geodesic.mathdoc.fr/item/FAA_1979_13_3_a2/
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