Dr. Md. Rafiqul Islam, Professor, Department of Population Science and Human Resource Development, University of Rajshahi, Rajshahi-6205, Bangladesh
E-mail: rafique_pops@yahoo.com

Dr. VENKATESWARLU B, Professor of Mathematics & Director of MCA in Sreenivasa Institute of Technology and Management Studies(SITAMS), India
E-mail: venkuor@gmail.com