de Melo, S.R., Mandarim de Lacerda, C.A. and de Souza, R.R. 2008. Superstructural features of the wistar strain male rats’ sinoatrial node (SAN). Acta Scientiarum. Health Sciences. 24, (Apr. 2008), 681-685. DOI:https://doi.org/10.4025/actascihealthsci.v24i0.2485.