M. Jansen, K. Sachdeva, and A. Harrer. Proceedings of the Workshop on Expressive Media and Intelligent Tools for Learning (German Conference on Artificial Intelligence KI-2003), , (2003)Hamburg 2003.
S. Goyal, N. Sachdeva, and T. Sachdeva. International Journal on Recent and Innovation Trends in Computing and Communication, 3 (4):
2255--2260(April 2015)