@article{02123942, title = {Symmetrization of starlike domains in Riemannian manifolds and a qualitative generalization of Bishop's volume comparison theorem.}, journal = {Advances in Geometry}, volume = {4}, year = {2004}, pages = {341-363}, doi = {10.1515/advg.2004.020}, zbl = {1079.53025}, language = {en}, url = {http://dml.mathdoc.fr/item/02123942} }
Fukuoka, Ryuichi. Symmetrization of starlike domains in Riemannian manifolds and a qualitative generalization of Bishop's volume comparison theorem.. Advances in Geometry, Tome 4 (2004) pp. 341-363. doi : 10.1515/advg.2004.020. http://gdmltest.u-ga.fr/item/02123942/