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.
G. H. Gessert. Four Valued Logic for Relational Database Systems. SIGMOD Record, 19(1):29-35, 1990. [doi]
Abstract is missing.