Ahlawat, K. S. “Effect of Oral Ibuprofen and Oral Acetaminophen in the Treatment of Symptomatic Patient Ductus Arteriosus in Premature Infants”. Asian Journal of Clinical Pediatrics and Neonatology, Vol. 5, no. 1, Mar. 2017, pp. 15-18, https://aijournals.com/index.php/ajcpn/article/view/2218.