T. Fujita, K. Masaki, F. Suzuki, and K. Maenaka. CME 2007: IEEE/ICME International Conference on Complex Medical Engineering, Beijing, China, page 416-420. (2007)
P. Vitanyi. (2012)cite arxiv:1201.1221Comment: 4 pages, Latex; Series of Publications C, Report C-2011-45, Department of Computer Science, University of Helsinki, pp. 71-74.
M. Hearst. Proceedings of the 37th annual meeting of the Association for Computational
Linguistics on Computational Linguistics, page 3--10. Morristown, NJ, USA, Association for Computational Linguistics, (1999)