Jan Paredaens, Lev A. Tenenbaum (Eds.):
Advances in Database Systems:
Implementations and Applications, CISM Courses and Lectures No. 347, International Centre for Mechanical Sciences, Udine, September 13-24, 1993. Springer Verlag, Wien, 1994, ISBN 3-211-82614-9
Lev A. Tenenbaum: Acyclic Hypergraphs and Relational Databases (A Survey). 1-28
Jan Paredaens: Foundations of Database Systems: An Introductory Tutorial. 29-48