“Comparison of frequency of tachycardia of Caffeine versus Aminophylline for Apnea of Prematurity”, Pjmcr, vol. 4, no. 4, pp. 1266–1274, Oct. 2025, Accessed: Aug. 30, 2026. [Online]. Available: https://pakjmcr.com/index.php/1/article/view/307