P. Galego Fernandes, M. Bahir, J. Mendonça, P. Carreira, Y. Fakir, y M. O. Silva, «Anthropogenic features in the Sines (Portugal) and Essaouira (Morocco) coastal aquifers: a comparative study of their hydrochemical evolution by a Principal Component Analysis»., Estud. geol., vol. 61, n.º 3-6, pp. 207–219, dic. 2005.