H. Li, R. Srihari, C. Niu, und W. Li. Proceedings of the HLT-NAACL 2003 workshop on Analysis of geographic references - Volume 1, Seite 39--44. Stroudsburg, PA, USA, Association for Computational Linguistics, (2003)
C. Liu, H. Yang, J. Fan, L. He, und Y. Wang. Proceedings of the 19th international conference on World wide web, Seite 681--690. New York, NY, USA, ACM, (2010)