TY  - DATA
AU  - Liu, Wensheng
AU  - Sussmann, Hector J.,
TI  - Shortest paths for sub-Riemannian metrics on rank-two distributions 
T2  - Memoirs of the American Mathematical Society, 
SN  - 9781470401436 (online)
PY  - 1995///
CY  - Providence, R.I.
PB  - American Mathematical Society
UR  - http://www.ams.org/memo/0564
ER  -