Bernhard M., H. Fasshuber, W. Robien, L. Brecker & H. Greger 2011. Dopamine-iridoid alkaloids in Carapichea affinis (= Psychotria borucana) confirm close relationship to the vomiting root Ipecac. Journal of Biochemical Systematics and Ecology 39 (2011): 232 – 235.