Gotthard Weise, Generalization and extension of the Wallace theorem,
Forum Geometricorum, 12 (2012) 1--11.

Abstract.   In the Wallace theorem we replace the projection directions (altitudes of the reference triangle) by all permutations of a general direction triple, and regard simultaneously the projections of a point P to each sideline. Introducing a pair of Wallace points and a pair of Wallace triangles, we present their properties and some connections to the Steiner ellipses.

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