García-Garizábal, I., J. Causapé Valenzuela, and R. Abrahão. “Evolution of the Efficiency and Agro-Environmental Impact of a Traditional Irrigation Land in the Middle Ebro Valley (2001-2007)”. Spanish Journal of Agricultural Research, Vol. 7, no. 2, 1, pp. 465-73, doi:10.5424/sjar/2009072-1499.