Sonographic Evaluation of the Yolk Sac - Tan - 2012 - Journal of Ultrasound in Medicine - Wiley Online Library
Origin and function of the yolk sac in primate embryogenesis | Nature Communications
Pilot study establishing a nomogram of yolk sac growth during the first trimester of pregnancy - Detti - 2020 - Journal of Obstetrics and Gynaecology Research - Wiley Online Library