Notes, Comments and Preliminary results Jun 30 2013 Helmi Hamdi and Rashid Sbia   The relationship between natural resources rents, trade openness and economic growth in Algeria   Abstract  Contact Information  Citation  Full Text  -  Preliminary Result   May 14 2013 Helmi Hamdi , Rashid Sbia , Hakimi Abdelaziz and Wafa Khlaifia hakimi   Multivariate Granger causality between foreign direct investment and economic growth in Tunisia   Abstract  Contact Information  Citation  Full Text  -  Preliminary Result