F. Soto-Landeros, L. Alcaraz-Meléndez, M. A. Angulo-Escalante, T. Reynoso-Granados, P. Cruz-Hernández, and F. Herrera-Cedano, “Pollen morphology of four species of Jatropha (Euphorbiaceae), including toxic varieties, in Northwestern Mexico”, Rev. Biol. Trop., vol. 65, no. 2, pp. 799–806, Jun. 2017.