title: minimization of tree pattern queries. authors: sihem amer-yahia , divesh srivastava , laks v. s. lakshmanan , sungran cho. venue: sigmod conference. year: 2001
title: minimization of tree pattern queries. authors: sihem amer-yahia , sungran cho , laks v. s. lakshmanan , divesh srivastava. venue: international conference on management of data. year: 2001