Lumbanraja SN, Yasnil MR, Siahaan AMP. Examination of Systole/Diastole Ratio of Umbilical Artery in the third Trimester Gestational Pregnancy and its Correlation with Lactate Acid Level in Fetal Cord. Open Access Maced J Med Sci [Internet]. 2020 Apr. 20 [cited 2024 Nov. 21];8(B):253-7. Available from: https://oamjms.eu/index.php/mjms/article/view/4071