%0 Journal Article
%A Hsiang, Fu Cheng
%T On a theorem of Burkill-Petersen
%J Portugaliae mathematica
%D 1963
%P 137-141
%V 22
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/PORMA_1963__22_3_114902/
%G en
%F PORMA_1963__22_3_114902