Gonçalves, José Francisco de Carvalho, Ulysses Moreira dos Santos Júnior, José Ferreira da Silva, Murilo Rodrigues de Arruda, Luiz Carlos de Matos Bonates, and Andreia Varmes Fernandes. 2006. “Physiological and Anatomical Characteristics of Leaves of Two Clones of Guarana”. Pesquisa Agropecuaria Brasileira 41 (3):393-98. https://doi.org/10.1590/S1678-3921.pab2006.v41.7150.