GEMZELL, C A Observations on circulatory changes and muscular work in normal labour. [electronic resource] - Acta obstetricia et gynecologica Scandinavica 1957 - 75-92 p. digital Publication Type: Journal Article ISSN: 0001-6349 Standard No.: 10.3109/00016345709158025 doi Subjects--Topical Terms: Blood CirculationElectrocardiographyFemaleFetal DevelopmentHumansLabor, Obstetric--physiologyMuscles--physiologyPregnancy