V. Nagarajan, K. Senthamaraikannan, D. Nagarajan and P. Arumugam
Journal of Modern Mathematics and Statistics 1 ( 1 ): 1 - 2 , 2007
K. Senthamaraikannan, V. Nagarajan, D. Nagarajan and P. Arumugam
Research Journal of Applied Sciences 2 ( 9 ): 963 - 965 , 2007