Peter J. C. Moses, Circles and Triangle Centers Associated with the Lucas Circles,
Forum Geometricorum, 5 (2005) 97--106.

Abstract: The Lucas circles of a triangle are the three circles mutually tangent to each other externally, and each tangent internally to the circumcircle of the triangle at a vertex. In this paper we present some further interesting circles and triangle centers associated with the Lucas circles.

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