Aires, E.D., Stefanini, M.A. and Orsi, A.M. (2000) “Ultrastructural features and differentiation of the spermatids in Brycon orbignyanus during the spermiogenesis”, Brazilian Journal of Veterinary Research and Animal Science, 37(3), pp. 183–188. doi:10.1590/S1413-95962000000300002.