title: cost-based optimization for magic : algebra and implementation. authors: p seshadri , j hellerstein , h pirahesh , t leung , r ramakrishnan , d srivastava , p stuckey , s sudarshan. venue: sigmod conference. year: 1996
title: query algebra and optimization for relational top-k queries. authors: c li , k chang , i ilyas , s song. venue: nan. year: 2005.0