J. Atkinson, and A. Rivas. IEEE transactions on information technology in biomedicine : a publication of the IEEE Engineering in Medicine and Biology Society, 12 (6):
714--722(November 2008)
C. Giuliano, A. Lavelli, D. Pighin, and L. Romano. Proceedings of the Fourth International Workshop on Semantic Evaluations
(SemEval-2007), page 141--144. Prague, Czech Republic, Association for Computational Linguistics, (June 2007)