János Demetrovics, Gyula O. H. Katona. Extremal Combinatorial Problems of Database Models. In Joachim Biskup, János Demetrovics, Jan Paredaens, Bernhard Thalheim, editors, MFDBS 87, 1st Symposium on Mathematical Fundamentals of Database Systems, Dresden, GDR, January 19-23, 1987, Proceedings. Volume 305 of Lecture Notes in Computer Science, pages 99-127, Springer, 1987. [doi]
Abstract is missing.