%0 Journal Article
%A M. A. Frumkin
%T A filtration in the three-dimensional Cremona group
%J Sbornik. Mathematics
%D 1973
%P 191-208
%V 19
%N 2
%U http://geodesic.mathdoc.fr/item/SM_1973_19_2_a3/
%G en
%F SM_1973_19_2_a3