Portela, I., M. Jacob, N. Mulenas, and A. Lares. “Intraoperative Hypercapnia in Transanal Minimally Invasive Surgery: A Case Report”. Journal of the Portuguese Society of Anesthesiology, vol. 28, no. 1, Apr. 2019, pp. 70-72, doi:10.25751/rspa.15971.