García López, J. M., J. Gonzalo Jiménez, and C. Allue Camacho. “Phytoclimatic Characterization of Holm-Oak Provenances (Quercus Ilex L.) in the Central-Northern Iberian Peninsula”. Forest Systems, Vol. 11, no. 1, June 2002, pp. 77-96, doi:10.5424/760.