"What are the effects of oil price shocks on the real exchange rates of oil exporting countries? A nonlinear smooth-transition approach" with Alfred Haug and Perry Sadorsky, May 2017. "Risk-sharing in federations: Theory and evidence" with Ahmed Saber Mahmud, Faruk Balli and Sumit Joshi, November 2015. "Does economic growth matter? Technology-push, demand-pull, and endogenous drivers of innovation in the renewable energy industry" with Sam Aflaki and Andrea Masini, May 2017. "Towards an initial crop portfolio in food-insecure Arab micro-states with embryonic agriculture: A constrained optimization approach" with David Raboy, July 2014. "The determinants of bilateral cross-border bond and equity flows: A sectoral analysis" with Faruk Balli and Hatice Balli, May 2013. "Has the non-oil sector decoupled from oil sector? A case study of Gulf Cooperation Council countries" Unpublished, March 2010.