Escobar, José Ricardo, Maria Pinheiro Fernandes Corrêa, and Francisco Peralta Aguilera. 2014. “Floral Structures, Flowering and Controlled Pollination Techniques in Guaraná”. Pesquisa Agropecuaria Brasileira 19 (5):615-22. https://doi.org/10.1590/S1678-3921.pab1984.v19.15721.