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.
Terry A. Halpin, Henderik Alex Proper. Subtyping and Polymorphism in Object-Role Modelling. Data \& Knowledge Engineering, 15(3):251-281, 1995. [doi]
Abstract is missing.