Santos, R. M., Leite, C. R., Monteiro, F. de O., Abreu, M. B. de, Lessa, D. A. B. and Santos, O. J. dos (2015) “Electrocardiographic evaluation of healthy dogs treated with ophthalmic solution of timolol maleate 0.5%: preliminary study”, Brazilian Journal of Veterinary Research and Animal Science, 52(2), pp. 112-119. doi: 10.11606/issn.1678-4456.v52i2p112-119.