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 Gynecology182 (1 Pt 1): 147-153. PMID10649170. doi:10.1016/S0002-9378(00)70504-7.
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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 Gynecology182 (1 Pt 1): 147-153. PMID10649170. doi:10.1016/S0002-9378(00)70504-7.