Utomo,M Tri, , Etika,R , , Rahman,M Abdul, , Sampoerna,M Tri Arif, and Samosir,S Mariana. "Effect of Hemodynamic Significant Patent Ductus Arteriosus on Tissue Oxygenation in Preterm Infants using Near-Infrared Spectroscopy", Iranian Journal of Neonatology, 13, 1, 2022, 55-61. doi: 10.22038/ijn.2022.55757.2040