X. Chai, B. Vuong, A. Doan, und J. Naughton. Proceedings of the 35th SIGMOD international conference on Management of data, Seite 87--100. New York, NY, USA, ACM, (2009)
M. Hu, E. Lim, A. Sun, H. Lauw, und B. Vuong. Proceedings of the Sixteenth ACM Conference on Conference on Information and Knowledge Management, Seite 243--252. New York, NY, USA, ACM, (2007)