(1)A pair-wise approach to testing for output and growth convergence
Journal of Econometrics
Volume 138, Issue 1, May 2007, Pages 312-355
URL : http://dx.doi.org/10.1016/j.jeconom.2006.05.024
(2)On the non-convergence of energy intensities: Evidence from a pair-wise econometric approach
Ecological Economics
Volume 69, Issue 3, 15 January 2010, Pages 641-650
URL :http://dx.doi.org/10.1016/j.ecolecon.2009.10.001