Alejano, R., and E. Martínez Montes. “Pinus Nigra Arn. Ssp. Salzmannii Natural Area: An Interpretation Supported by Ecological and Palaeoecological Data”. Forest Systems, Vol. 15, no. S1, Dec. 2006, pp. S124-S136, doi:10.5424/srf/200615S1-00987.