title: bifocal sampling for skew-resistant join size estimation. authors: abraham silberschatz , sumit ganguly , yossi matias , phillip b. gibbons. venue: sigmod conference. year: 1996
title: bifocal sampling for skew-resistant join size estimation. authors: sumit ganguly , phillip b. gibbons , yossi matias , avi silberschatz. venue: international conference on management of data. year: 1996