Adding a Closure Operator to the Extended Relational Algebra: A Further Step Towards the Integration of Database Techniques and Logic Programming.

Luigia Carlucci Aiello Carlo Cecchi Adding a Closure Operator to the Extended Relational Algebra: A Further Step Towards the Integration of Database Techniques and Logic Programming. 179-202 1985 Foundations of Knowledge Base Management (Xania) db/conf/db-workshops/xania85.html#AielloC85