K. Meenakshi Sundaram and C.S. Ravichandran
Asian Journal of Scientific Research 7 ( 1 ): 18 - 32 , 2014
K. Meenakshi Sundaram, T. Santhanam, M. Saroja and C. P. Sumathi
Journal of Computer Science 6 ( 4 ): 386 - 391 , 2010