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.
Alain Pirotte. A Precise Definition of Basic Relational Notions and of the Relational Algebra. SIGMOD Record, 13(1):30-45, 1982. [doi]