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Bortolus, Renata; Fabio Parazzini, Liliane Chatenoud, Guido Benzi, Massimiliano Maria Bianchi, Alberto Marini (1999). «The epidemiology of multiple births». Human Reproduction Update (European Society of Human Reproduction and Embryology) 5 (2): 179–187. doi:10.1093/humupd/5.2.179. ISSN1355-4786. PMID10336022.