Foto N. Afrati, Matthew Damigos, Manolis Gergatsoulis. Union rewritings for XPath fragments. In Bipin C. Desai, Isabel F. Cruz, Jorge Bernardino, editors, 15th International Database Engineering and Applications Symposium (IDEAS 2011), September 21 - 27, 2011, Lisbon, Portugal. pages 43-51, ACM, 2011. [doi]
Abstract is missing.