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Acta Obstetricia et Gynecologica Scandinavica Volume 70, 1991 - Issue 6
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Original Article

A circadian variation in the observed duration of labor

Bjørn Backe Norwegian Institute for Hospital Research, Trondheim, Norway
Pages 465-468 | Received 14 Dec 1990, Accepted 25 Jun 1991, Published online: 03 Aug 2009

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S. Bagci, H. Sabir, A. Müller & R.J. Reiter. (2020) Effects of altered photoperiod due to COVID-19 lockdown on pregnant women and their fetuses. Chronobiology International 37:7, pages 961-973.
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Elena Toffol, Oskari Heikinheimo & Timo Partonen. (2016) Biological rhythms and fertility: the hypothalamus–pituitary–ovary axis. ChronoPhysiology and Therapy 6, pages 15-27.
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Svein Rasmussen, Leif Bungum And & Karin Hoie. (1994) Maternal age and duration of labor. Acta Obstetricia et Gynecologica Scandinavica 73:3, pages 231-234.
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