Kiserud, T.; Rasmussen, S.; Skulstad, S. (2000). “Blood flow and the degree of shunting through the ductus venosus in the human fetus”. 《American Journal of Obstetrics and Gynecology》 182 (1 Pt 1): 147–153. doi:10.1016/S0002-9378(00)70504-7. PMID10649170.
Kiserud, T.; Rasmussen, S.; Skulstad, S. (2000). “Blood flow and the degree of shunting through the ductus venosus in the human fetus”. 《American Journal of Obstetrics and Gynecology》 182 (1 Pt 1): 147–153. doi:10.1016/S0002-9378(00)70504-7. PMID10649170.