J. Nothman, T. Murphy, и J. Curran. EACL '09: Proceedings of the 12th Conference of the European Chapter of the Association for Computational Linguistics, стр. 612--620. Morristown, NJ, USA, Association for Computational Linguistics, (2009)
K. Dill, J. Herzog, и M. Perkowski. Communications, Computers and Signal Processing,
PACRIM 1997, 2, стр. 823--826. Victoria, BC, Canada, (20-22 August 1997)