1. Center for Environmental Management and Control, University of Nigeria, Enugu Campus, Enugu 410001, Nigeria
2. Department of Management and Management Science, Lubin School of Business, Pace University, New York, NY 10038, USA
3. School of Biological, Earth and Environmental Sciences, University College Cork, Distillery Field Campus, North Mall, T23 TK30 Cork, Ireland
4. Nuclear Science and Technology, Department of Engineering, North-West University, Potchefstroom Campus, 11 Hoffman Street, Potchefstroom 2520, South Africa