B. Lavoie, O. Rambow, and E. Reiter. Proceedings of the Fifth Conference on Applied Natural Language Processing (ANLP-97), page 253--256. Morristown, NJ, USA, Association for Computational Linguistics, (1997)
S. Auer, C. Bizer, G. Kobilarov, J. Lehmann, R. Cyganiak, and Z. Ives. Proceedings of the 6th International Semantic Web Conference (ISWC), volume 4825 of Lecture Notes in Computer Science, page 722--735. Springer, (2008)