P. E. Caines and R. Hermann.APSM Workshop on System Geometry, Symtem Identification, and Parameter Estimation(1981 : Northeastern Univ.)：Geometry and identification : proceedings of APSM Workshop.Math Sci pr.,1983.
APSM Workshop on System Geometry, Symtem Identification, and Parameter Estimation(1981 : Northeastern Univ.)：Geometry and identification : proceedings of APSM Workshop
