Nedelcheva, E [Indirect recording of the fetal electrocardiography at various intervals of normal pregnancy]. [electronic resource] - Akusherstvo i ginekologiia 1971 - 1-14 p. digital Publication Type: Journal Article ISSN: 0324-0959 Subjects--Topical Terms: ElectrocardiographyFemaleFetal Heart--physiologyHumansPregnancy