Pereira, Jomar da Paes, and Adroaldo Guimarães Rossetti. “Influence of the Number of Primary Roots and Mulching on Vegetative Development of Rubber Seedlings in Nursery”. Pesquisa Agropecuaria Brasileira, vol. 21, no. 8, Apr. 2014, pp. 879-83, doi:10.1590/S1678-3921.pab1986.v21.14934.