Pozzatti, P. N., L. C. Porfírio, A. Maioli, W. G. Santos, F. S. Costa, L. C. Nunes, and M. S. Zanini. 2015. “Transtracheal Aspirate in the Diagnosis of Affections the Lower Respiratory System of Dogs”. Pubvet 4 (33). https://ojs.pubvet.com.br/index.php/revista/article/view/2472.