Taha, M. M., Draz, R. S., Gamal, M. M., & Ibrahim, Z. M. (2021). Adding autogenic drainage to chest physiotherapy after upper abdominal surgery: effect on blood gases and pulmonary complications prevention. Randomized controlled trial. São Paulo Medical Journal, 139(6), 556–563. Retrieved from https://periodicosapm.emnuvens.com.br/spmj/article/view/536