Eric Danneels, The Eppstein Centers and the Kenmotu Points,
Forum Geometricorum, 5 (2005) 173--180.

Abstract: The Kenmotu points of a triangle are triangle centers associated with squares each with a pair of opposite vertices on two sides of a triangle. Given a triangle ABC, we prove that the Kenmotu points of the intouch triangle are the same as the Eppstein centers associated with the Soddy circles of ABC.

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