6[1]Davis R, Buchanan B,Shortcliffe E H.Production Rules as a Represen-tation for a Knowledge-base Consultation Program. Artificial Intellig-ence, 1977,8( 1 ): 15～45
7[2]Clancey W J.The Knowledge Level Reinterpreted: Modeling How Systems Interact. Machine Learning, 1989,4(5):285～291
8[3]Morik K.Underlying Assumptions of Knowledge Acquisition as a Process of Model Refinement. Knowledge Acquisition, 1990,2( 1):21～49
