R. Rodríguez Ochoa, J. R. Olarieta Alberdi, C. Chocarro, V. Martínez, and I. Bilbao, “Autoecology and potencial distribution of holm oak (Quercus ilex subsp. ballota (Desf.) Samp.) in North Monegros”, ECOS, vol. 23, no. 2, pp. 108–115, May 2014.