TY  - GEN
AU  - Calin, Ovidiu
AU  - Chang, Der-Chen 
TI  - Sub-riemannian geometry: general theory and examples, Vol. 126
SN  - 9780521897303
U1  - 516.373 
PY  - 2009///
CY  - New York
PB  - Cambridge University Press
KW  - Mathematics
KW  - Geometry
KW  - Analytic
KW  - Riemannian
N2  - A comprehensive text and reference on sub-Riemannian and Heisenberg manifolds using a novel and robust variational approach
ER  -