Paris Pamfilos, On the cyclic complex of a cyclic quadrilateral,
Forum Geometricorum 6 (2006) 29--46.

Abstract: To every cyclic quadrilateral corresponds naturally a complex of sixteen cyclic quadrilaterals. The radical axes of the various pairs of circumcircles, the various circumcenters and anticenters combine to interesting configurations. Here are studied some of these, considered to be basic in the study of the whole complex.

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