Forum Geometricorum, 1 (2001) 1 -- 6.

Abstract: If we erect on the sides of a scalene triangle
three squares, then at the vertices of the triangle we find new triangles,
the *flanks*. We study pairs of triangle centers X and Y such that the
triangle of X's in the three flanks is perspective with ABC at Y, and vice
versa. These centers X and Y we call *friends*. Some examples of friendship
among triangle centers are given.

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Geometricorum, volume 1.