title: on the minimization of xpath queries. authors: elio masciari , sergio flesca , filippo furfaro. venue: vldb. year: 2003
title: tree pattern query minimization. authors: s. amer-yahia , s. cho , l. v. s. lakshmanan , d. srivastava. venue: the vldb journal -- the international journal on very large data bases. year: 2002