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van Weeren, P.R., L. L. Rodríguez, L. J. Poveda, Juan Alberto Morales, Humberto Cedeño Guevara, et Jorge Villalobos. Mortality Supposedly Due to Intoxication By Pyrrolizidine Alkaloids From Heliotropium Indicum in a Horse Population in Costa Rica: A Case Report. 2011.

van Weeren, P.R., et al. Mortality Supposedly Due to Intoxication By Pyrrolizidine Alkaloids From Heliotropium Indicum in a Horse Population in Costa Rica: A Case Report. 2011.