N. Sanajaoba Singh and N. Sharat Singh
Journal of Modern Mathematics and Statistics 6 ( 1 ): 1 - 6 , 2012
N. Sharat Singh, W. Tomba Singh, N. Sanajaoba Singh and S. Brajabidhu Singh
Journal of Modern Mathematics and Statistics 7 ( 2 ): 14 - 20 , 2013