C. Fijen, E. Kuijper, M. te Bulte, M. Daha, and J. Dankert. Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America, 28 (1):
98--105(January 1999)PMID: 10028078.
D. Nguyen, N. Smith, and C. Rosé. Proceedings of the 5th ACL-HLT Workshop on Language Technology for Cultural Heritage, Social Sciences, and Humanities, page 115--123. Stroudsburg, PA, USA, Association for Computational Linguistics, (2011)