%0 Journal Article
%A Ge, Zhong
%T Collapsing Riemannian Metrics to Carnot-Caratheodory Metrics and Laplacians to Sub-Laplacians
%J Canadian journal of mathematics
%D 1993
%P 537-553
%V 45
%N 3
%U http://geodesic.mathdoc.fr/articles/10.4153/CJM-1993-028-6/
%R 10.4153/CJM-1993-028-6
%F 10_4153_CJM_1993_028_6