G. Gottlob, C. Koch, R. Baumgartner, M. Herzog, и S. Flesca. Proceedings of the Twenty-third ACM SIGACT-SIGMOD-SIGART Symposium
on Principles of Database Systems, June 14-16, 2004, Paris, France, стр. 1-12. ACM, (2004)
S. Simoff. Proceedings of the MDKM/KDD2000 Workshop on
Multimedia Data Mining, стр. 104--109. www.cs.ualberta.ca/~zaiane/mdm\_kdd2000/mdm00-15.pdf, (2000)