T. Sandholm, and K. Lai. SIGMETRICS '09: Proceedings of the eleventh international joint conference on Measurement and modeling of computer systems, page 299--310. New York, NY, USA, ACM, (2009)
T. Elsayed, J. Lin, and D. Oard. Proceedings of the 46th Annual Meeting of the Association for Computational Linguistics on Human Language Technologies: Short Papers, page 265--268. Stroudsburg, PA, USA, Association for Computational Linguistics, (2008)