Unit root tests in panel data: asymptotic and finite-sample propertiesAndrew Levin, Chien-Fu Lin and Chia-Shang James Chu
Journal of Econometrics
Volume 108, Issue 1, May 2002, Pages 1-24
http://www.sciencedirect.com/science/article/B6VC0-45BDH6F-1/2/50d29c68c05b386471d30c00a877f855



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