1Duffy S M,Duffy A H/3. Sharing the learning activity using in- telligent CAD[J]. Artificial Intelligence for Engineering, De- sign, Analysis and Manufacturing, 1996,10 (2) : 83 - 100.
2Liu Wei, He Yuanjun. Representation and retrieval of 3D CAD models in parts library[J]. The International Journal of Ad- vanced Manufacturing Technology,2008(9-10):950-958.
