Clark Kimberling, Translated triangles perspective to a reference triangle,
Forum Geometricorum, 6 (2006) 269--284.

Abstract: Suppose A, B, C, D, E, F are points and L is a line other than the line at infinity. This work examines cases in which a translation D'E'F' of DEF in the direction of L is perspective to ABC,  in the sense that the lines AD', BE', CF' concur.

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