Hector J S,Guoqing T.Shortest paths for the reeds-sheep car:a worked out example of the use geometric,techniques in nonlinear optimal control[J].Rutgers Center for Systems and Control Technical Report,1991,91(10):1~7.
Boscain U,Nikolaev I,Piccoli B.Classification of stable time-optimal controls on 2-manifolds[J].Journal of Mathematical Sciences,2006,135(4):3 109~3 124.