1. L.J. Ball, N.J. Lambell, Th.C. Ormerod, Si. Slavin and J.A. Mariani: Automation in Construction 10 (2001), pp.663-674.
2. Fr.M.T. Brazier, Pi.H.G. van langen, J. Treur and Ni.J.E. Wijingaards: Knowledge-Based Syestems 9(1996), pp.105-118.
3. J. Du,Y. Cao: Journal of Xi'an University of Technology Vol. 26(6)(2006), P. 510-514, 521(in chinese).
4. X.S. Ceng, F. Liu: Computer Integrated Manufacture system Vol. 13(8)(2007)Vol. (in chinese).
5. Y. Wang: Journal of Chniese Mechanical Engineering, 2002(in chinese).