Azambuja, A. C. M. (2016) “Volumetric incentive spirometer and positive pressure after cardiac surgery”, Journal of Respiratory and CardioVascular Physical Therapy, 4(1), pp. 21–28. Available at: https://www.periodicos.ufrn.br/revistadefisioterapia/article/view/7943 (Accessed: 12 February 2026).