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.
Horst Biller. On the equivalence of data base schemas - a semantic approach to data translation. Inf. Syst., 4(3):35-47, 1979.
Abstract is missing.