title: fast algorithms for universal quantification in large databases. authors: goetz graefe , richard l. cole. venue: acm trans . database syst .. year: 1995.0
title: optimizing queries with universal quantification in object-oriented and object-relational databases jens clau &#223; en , alfons kemper , guido moerkotte , klaus peithner. authors: nan. venue: very large data bases. year: 1997.0