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Fibula prenestina
https://it.wikipedia.org/wiki/Fibula_prenestina#/media/File:Praeneste_fibula.JPG
Federico II, De arte venandi cum avibus
https://digi.vatlib.it/view/MSS_Pal.lat.1071
Erich Auerbach, Figura
http://nuovoludo.altervista.org/alterpages/files/FIGURA-AUERBACH.pdf