Fournier, A. T., M. del M. Gamboa, and M. L. Arias. “Genes That Encode Botulism Neurotoxins A, B, E and F in Neotropical Bee Honey Identified With the Polymerase Chain Reaction”. Revista De Biología Tropical, vol. 54, no. 1, Mar. 2006, pp. 29–34, doi:10.15517/rbt.v54i1.13984.