L. Dietz, S. Bickel, und T. Scheffer. Proceedings of the 24th international conference on Machine learning, Seite 233--240. New York, NY, USA, ACM, (2007)
M. Simkin, und V. Roychowdury. Journal of the American Society for Information Science & Technology, 58 (11):
1661-1673(September 2007)IL: 3 charts, 1 diagram, 2 graphs.