title: efficient approximation of optimization queries under parametric aggregation constraints. authors: s guha , d gunopulos , n koudas , d srivastava , m vlachos. venue: vldb. year: 2003
title: optimization of constrained frequent set queries : 2-var constraints. authors: lvs lakshmanan , r ng , j han , a pang. venue: 3rd sigmodâ ?? 98 workshop on research issues in data mining. year: nan