Penttilä I. M., Puhakainen E., and Ryynänen M. “Selecting a Sensitive Immunoradiometric Method of Maternal Serum Alphafetoprotein for Prenatal Screening of Abnormalities in the Fetus”. Upsala Journal of Medical Sciences 95, no. 3 (September 1, 1990): 287-290. Accessed May 3, 2024. https://ujms.net/index.php/ujms/article/view/6786.