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E. G. Mesa, J. A. Peral: Incidence and costs of multifetal pregnancies in Andalusia (2000–2010). In: Twin research and human genetics: the official journal of the International Society for Twin Studies. Band 14, Nummer 5, Oktober 2011, S. 484–489, ISSN1832-4274. doi:10.1375/twin.14.5.484. PMID 21962143.
E. G. Mesa, J. A. Peral: Incidence and costs of multifetal pregnancies in Andalusia (2000–2010). In: Twin research and human genetics: the official journal of the International Society for Twin Studies. Band 14, Nummer 5, Oktober 2011, S. 484–489, ISSN1832-4274. doi:10.1375/twin.14.5.484. PMID 21962143.