Bravo, L., Wenfei, F., W., Geerts, F. and Shuai, M. (2008). 'Increasing Expressivity of Conditional Functional Dependencies without Extra Charge of Complexity'. The 24th International Conference on Data Engineering (ICDE). You can also download a postprint.

Wenfei, F. and Bohannon, P. (2008). 'Information Preserving XML Schema Embedding'. ACM Transactions on Database Systems (TODS), vol. 33, no. 1, 2008, article 4.