Memoirs of the American Mathematical Society, ISSN 0065-9266 ; Volume 118, Number 564
Print version: Liu, Wensheng, 1962- Shortest paths for sub-Riemannian metrics on rank-two distributions. Providence, Rhode Island, United States : American Mathematical Society, c1995 ix, 104 pages Memoirs of the American Mathematical Society ; Volume 118, Number 564. ISBN 9780821804049