title: optimizing the secure evaluation of twig queries. authors: sihem amer-yahia , divesh srivastava , sungran cho , laks v. s. lakshmanan. venue: vldb. year: 2002
title: parallel evaluation of multi-join queries. authors: annita n. wilschut , jan flokstra , peter m. g. apers. venue: international conference on management of data. year: 1995