J. Lafferty, A. McCallum, und F. Pereira. Proc. 18th International Conf. on Machine Learning, Seite 282--289. Morgan Kaufmann, San Francisco, CA, (2001)
Y. Zhou, L. Wu, F. Weng, und H. Schmidt. Proceedings of the 2003 conference on Empirical methods in natural language processing, Seite 153--159. Morristown, NJ, USA, Association for Computational Linguistics, (2003)
H. Han, C. Giles, E. Manavoglu, H. Zha, Z. Zhang, und E. Fox. JCDL '03: Proceedings of the 3rd ACM/IEEE-CS joint conference on Digital libraries, Seite 37--48. Washington, DC, USA, IEEE Computer Society, (2003)