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== Nexus externi ==

*[http://www.ehd.org/prenatal-images-index.php Perscriptio Pinacothecae Imaginum Praenatalium.] Endowment for Human Development, ehd.org.

*[http://channel.nationalgeographic.com/episode/in-the-womb-2228?fs=www3.nationalgeographic.com#tab-Videos/01586_05 ''In the Womb.''] [[Pellicula]] a National Geographic facta.