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.
Clark Glymour. The hierarchies of knowledge and the mathematics of discovery. Minds and Machines, 1(1):75-95, 1991. [doi]
Abstract is missing.