Aamir Aslam Awan, et al. “Frequency and Causal Relationship of Pneumothorax in Premature Neonates in a Tertiary Care Hospital”. Pakistan Armed Forces Medical Journal, vol. 73, no. 5, Oct. 2023, pp. 1271-4, https://doi.org/10.51253/pafmj.v73i5.5395.