%0 Journal Article
%A Gaoyong Zhang
%T A positive solution to the Busemann-Petty problem in $\bbfR^4$
%J Annals of mathematics
%D 1999
%V 149
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/AM_1999_149_2_a6/
%F AM_1999_149_2_a6