title: optimizing the secure evaluation of twig queries vldb. authors: sihem amer-yahia , divesh srivastava , sungran cho , laks v. s. lakshmanan. venue: nan. year: 2002.0
title: optimizing queries on compressed bitmaps sihem amer-yahia , theodore johnson very large data bases. authors: nan. venue: nan. year: 2000.0