Harry Galuh Nugraha*, Edwam Akbar, Atta Kuntara. “Resistive Index Value of Superior Mesenteric Artery In Preterm Infants With Necrotizing Enterocolitis”. Innovative Journal of Medical and Health Sciences, vol. 10, no. 03, Mar. 2020, pp. 846-50, doi:10.15520/ijmhs.v10i03.2833.