P. de S. Gonçalves, L. A. Saes, E. L. Furtado, R. Sambugaro, and M. Sakai, “Promising <i>Hevea</i> clones for Ribeira River Valley region, São Paulo State, Brazil”, PAB, vol. 35, no. 12, pp. 2343–2353, Dec. 2000.