García López, J. M., and C. Allué Camacho. “Characterization and Phytoclimatic Potentialities of Quercus Petraea (Matt.) Liebl. and Quercus Robur L. Forests in Spain”. Forest Systems, Vol. 15, no. 3, Dec. 2006, pp. 277-95, doi:10.5424/srf/2006153-00971.