Wibowo, Noroyono, and Fitriana fitriana. “The Levels of Zinc, Selenium, Iron and Copper in Preterm Pregnancy Do Not Differ With Those of Healthy Pregnancy: Kadar Seng, Selenium, Besi Dan Tembaga Pada Kehamilan Prematur Tidak Berbeda Dengan Kehamilan Sehat”. Indonesian Journal of Obstetrics and Gynecology 7, no. 2 (April 26, 2019): 86–91. Accessed August 24, 2026. https://www.inajog.com/index.php/journal/article/view/880.