Assessment of laryngeal muscle and testicular cell types in Xenopus laevis (Anura Pipidae) inhabiting maize and non-maize growing areas of South Africa - Smith, E.E.; Du Preez, L.H.; Gentles, A.; Solomon, K.R.; Tandler, B.; Carr, J.A.; Van Der Kraak, G.; Kendall, R.J.; Giesy, J. P.; Gross, T. S. (African Journal of Herpetology, 2005)