Santos, R.M. et al. 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 (Jun. 2015), 112–119. DOI:https://doi.org/10.11606/issn.1678-4456.v52i2p112-119.