Ariza, J. A., M. J. M. Martínez, M. J. Olivera, and R. M. Balsalobre. “Comparative Study of Transthoracic Ultrasound and Chest X-Ray in the Postoperative Period of Thoracic Surgery”. International Surgery Journal, vol. 4, no. 9, Aug. 2017, pp. 2925-31, doi:10.18203/2349-2902.isj20173872.