M. abbas Choudhary M. Asif Naeem. IEEE International Conference on Advanced Computer vision and Information Technology, стр. 397-405. http://www.itvidya.com/acvit_2007_aurangabad, Department of Computer Science and IT, Dr. B.A.M. U Aurangabad. (MS) India, I. K. International, (декабря 2007)
A. Arasu, и H. Garcia-Molina. Proceedings of the 2003 ACM SIGMOD International Conference on Management of Data, San Diego, California, USA, June 9-12, 2003, стр. 337-348. ACM, (2003)