Wood, Peter (2000) Rewriting XQL queries on XML repositories. In: Lings, B. and Jeffery, K.G. (eds.) BNCOD 17: Advances in Databases. Lecture Notes in Computer Science 1832. Springer, pp. 209-226. ISBN 9783540677437.

Lawder, J.K. and King, Peter J.H. (2000) Using space-filling curves for multi-dimensional indexing. In: Lings, B. and Jeffery, K.G. (eds.) Advances in Databases, 17th British National Conference on Databases: BNCOD 17. Lecture Notes in Computer Science 1832. Springer, pp. 20-35. ISBN 9783540677437.