Imran, M., M. S. Khan, A. Baseer, and A. Bilal. “Mean Change in FEV1 by Comparing Postero-Lateral Thoracotomy Versus Muscle Sparing Thoracotomy”. Pakistan Journal of Chest Medicine, vol. 22, no. 4, Apr. 2017, pp. 159-64, https://pjcm.net/index.php/pjcm/article/view/425.