P. Brown, S. Pietra, V. Pietra, and R. Mercer. Proceedings of the 29th Annual Meeting of the ACL, Morristown, NJ, Morristown, NJ: Association for Computational Linguistics, (1991)
A. Neupane, M. Goodrich, and E. Mercer. AAMAS, page 2025-2027. International Foundation for Autonomous Agents and Multiagent Systems Richland, SC, USA / ACM, (2018)