R. Vercammen, J. Hidders, and J. Paredaens. Proc. of the 2nd International Workshop on Database Technologies for Handling XML Information on the Web (DataX 2006), 4254, page 250--263. Munich, Germany, (2006)
J. Hidders, and P. Michiels. Workshop on Programming Language Technologies for XML (PLAN-X 2004), NS-03-4, Venice, Italy, (December 2004)Available at: http://www.brics.dk/NS/03/4/BRICS-NS-03-4.pdf.
M. Fernández, J. Hidders, P. Michiels, J. Siméon, and R. Vercammen. Database and Expert Systems Applications, 16th International Conference, DEXA 2005, Copenhagen, Denmark, August 22-26, 2005, Proceedings, 3588, page 554--563. Copenhagen, Denmark, (2005)
B. ten Cate, and C. Lutz. PODS '07: Proceedings of the twenty-sixth ACM SIGMOD-SIGACT-SIGART symposium on Principles of database systems, page 73--82. New York, NY, USA, ACM, (2007)