Chetta, A., P. Tzani, and E. Marangio, et al. 2006. “Respiratory Effects of Surgery and Pulmonary Function Testing in the Preoperative Evaluation”. Acta Biomedica Atenei Parmensis 77 (2): 69-74. https://mattioli1885journals.com/index.php/actabiomedica/article/view/1988.