Dr. V. Ananthaswamy, Assistant Professor, Department of Mathematics, The Madura College (Autonomous), Madurai, Tamil Nadu, India.
E-mail: ananthu9777@gmail.com

Dr. Vishnu Narayan Mishra, Assistant Professor of Mathematics, Applied Mathematics & Humanities Dept., Sardar Vallabhbhai National Institute of Technology, Gujarat, India
E-mail: vishnu_narayanmishra@yahoo.co.in