TY  - JOUR
AU  - Gaoyong Zhang
TI  - A positive solution to the Busemann-Petty problem in $\bbfR^4$
JO  - Annals of mathematics
PY  - 1999
VL  - 149
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/AM_1999_149_2_a6/
ID  - AM_1999_149_2_a6
ER  -