Broquen, P., F. Candan, G. Falbo, J. L. Girardin, and A. Apcarian. “Pinus Ponderosa Dougl. Effect in Soil Reaction in Southwestern Neuquén, Argentina”. BOSQUE, vol. 23, no. 1, June 2002, pp. 47-59, doi:10.4206/bosque.2002.v23n1-05.