Sáenz R., J.A. and Nassar C., M. 1967. Phytochemical Screening of Costa Rican Plants: Alkaloid Analysis. III. Revista de Biología Tropical. 15, 1 (Jul. 1967), 195–202. DOI:https://doi.org/10.15517/rev.biol.trop. v15i1.28486.