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“A Comparative Study of Unit Root Tests with Panel Data and a New Simple Test” (with G.S. Maddala), Oxford Bulletin of Economics and Statistics 61 (November 1999), 631-52.
“Cross-Country Growth Regressions: Problems of Heterogeneity, Stability and Interpretation” (with G.S. Maddala). Applied Economics, 32 (2000), 635-642.
“Do Panel Data Rescue the Purchasing Power Parity (PPP) Theory” (with G.S. Maddala and P.C. Liu), in Panel Data Econometrics: Future Directions, J. Drishnakumar and E. Ronchetti (eds.), 35-52.
“Stationary Tests in Heterogeneous Panels” (with Y.Yin), in Nonstationary Panels, Panel Co-integration, and Dynamic Panels, B. Baltagi (Eds.), 275-296, Elsevier, 2000.
“Is Purchasing Power Parity Overvalued?” (with J.Wu), Journal of Money, Credit, and Banking, 33 (August 2001), 804-812.
“Spurious Regression with Integrated Regressors in Panel Data”, March 1997.
