Almeida, E. P. de, M. C. Duarte, J. Montessi, A. A. Cocate, F. F. Almeida, C. A. Gomes, and L. E. V. de C. Ferreira. “Activity of Alpha Amylase in the Tracheobronchial Secretions of Patients Without Morbid Salivary Aspiration”. Journal of Research in Biology, Vol. 6, no. 2, Feb. 2016, pp. 1959-66, https://ojs.jresearchbiology.com/index.php/jrb/article/view/411.