R. T. Abdullah, R. A. . Hamzah, and W. A. Mahbuba, “Effect of Preoperative Breathing Exercises Combination on Postoperative Respiratory Status and Pulmonary Complications for Patients with Cardiac Surgery”, Kufa Jour. Nurs. Sci., vol. 14, no. 2, pp. 110–123, Oct. 2024, doi: 10.36321/kjns.vi20242.16829.