title: Twins as monsters: Albertus Magnus's theory of the generation of twins and its philosophical context.
authors.forename: J M
authors.initials: JM
authors.lastname: Thijssen
mesh_terms: D009008:Abnormalities, Severe Teratoid / Q000266:history*; D006115:Greece; D049691:History, Medieval; D006801:Humans; D014427:Twins