Nguyen Minh Ha and Nguyen Pham Dat, TSynthetic proofs of two theorems related to the Feuerbach point,
Forum Geometricorum, 12 (2012) 39--46.

Abstract.   We give synthetic proofs of two theorems on the Feuerbach point of a triangle, one of Paul Yiu, and another of Lev Emelyanov and Tatiana Emelyanova theorem.

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