A. Schenker, H. Bunke, M. Last, and A. Kandel. Document Analysis Systems, volume 3163 of Lecture Notes in Computer Science, page 401-412. Springer, (2004)
C. Iglesias, M. Garrijo, and J. Gonzalez. Proceedings of the 5th International Workshop on Intelligent Agents V : Agent Theories, Architectures, and Languages (ATAL-98), 1555, page 317--330. Springer-Verlag: Heidelberg, Germany, (1999)