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4. —, Representing and enforcing e-commerce contracts using occurrences, Proceedings of the 4th International Conference on Electronic Commerce Research, Edwin L. Cox School of Business, Southern Methodist University, Dallas, Texas, USA, November 2001.
5. —, Representing and enforcing electronic commerce contracts over a wide range of platforms using occurrence stores, Fourth CaberNet Plenary Workshop (Pisa, Italy), October 2001.