Ordás Criado, Carlos; Valente, Simone and Stengos, Thanasis (2009): Growth and the pollution convergence hypothesis: A nonparametric approach. Unpublished.
Ordás Criado, Carlos (2007): Temporal and spatial homogeneity in air pollutants panel EKC estimations: Two nonparametric tests applied to Spanish provinces. Forthcoming in: Environmental and Resource Economics
