Y. Takeuchi, und M. Sugimoto. Proceedings of the 1st International Workshop on Personalized Context Modeling and Management for UbiComp Applications (2005), Seite 91--100. (2005)
Q. Li, Y. Zheng, X. Xie, Y. Chen, W. Liu, und W. Ma. Proceedings of the 16th ACM SIGSPATIAL international conference on Advances in geographic information systems, Seite 34. ACM, (2008)