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Barrallo, Javier; González-Quintial, Francisco; Sánchez-Beitia, Santiago (May 2015), "An Introduction to the Vesica Piscis, the Reuleaux Triangle and Related Geometric Constructions in Modern Architecture", Nexus Network Journal, 17 (2): 671–684, doi:10.1007/s00004-015-0253-9, S2CID122824246