MTree: an XML XPath graph index. - P. Mark Pettovello; Farshad Fotouhi (SAC, 2006)

Efficient XPath query processing. - P. Mark Pettovello; Farshad Fotouhi (CASCON, 2008)

XPath query processing improvements. - P. Mark Pettovello; Farshad Fotouhi (CASCON, 2010)