Pérez, J.E., Ramírez, N., Basoa, E., Alfonsi, C., Nusetti, O. and Moreno, J. 2000. Polymorphisms of Octopine dehydrogenase (Odh) in mollusks and implications for the neutralism-selectionism hypothesis. Revista de Biología Tropical. 48, S1 (Dec. 2000), 187–191.