%0 Journal Article %A R. S. Ismagilov %T A central extension of the group of volume-preserving diffeomorphisms, as inductive limit of groups of diffeomorphisms of coordinate neighborhoods %J Funkcionalʹnyj analiz i ego priloženiâ %D 1979 %P 71-72 %V 13 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/FAA_1979_13_4_a13/ %G ru %F FAA_1979_13_4_a13