Ebaidalla Mahjuob Ebaidalla, Faculty of Economic and Social Studies, University of Khartoum. 11115 Khartoum, Sudan. Phone: +49 912636114. Email address: ebaidalla@gmail.com
Fadia Khalil, Department of Economics, Faculty of Economic and Social studies- University of Khartoum, P. O. Box 321, Khartoum 11115, Sudan. Email: fadia_khassan@yahoo.com.
Professor Rashid Mekki Hassan, Center for Environmental Economics and Policy Analysis in Africa (CEEPA), University of Pretoria, Pretoria, South Africa. Phone: +27829079345. Email-Address: hassan@up.ac.za
Professor Emeritus Dr. Karl Wohlmuth, University of Bremen Department of Economics and Business Studies, P.O. Box 330 440, 28334 Bremen, Germany, Phone: +49 (0)421 218-66517. Email-Address: wohlmuth@uni-bremen.de
