Researchr is a web site for finding, collecting, sharing, and reviewing scientific publications, for researchers by researchers.
Sign up for an account to create a profile with publication list, tag and review your related work, and share bibliographies with your co-authors.
William J. Clancey. Viewing knowledge bases as qualitative models. IEEE Intelligent Systems, 4(2):9-23, 1989. [doi]
Abstract is missing.