Regato, P., Elena, R. and Sanchez Palomares, O. 1991. Comparative autoecological study of Pinus nigra Arn. ssp. salzmannii in the Iberian peninsula and other subspecies of the circun.mediterranean region. Forest Systems. 1 (Dec. 1991), 49-59. DOI:https://doi.org/10.5424/1293.