Cosmin Pohoata, On the Parry reflection point,
Forum Geometricorum, 8 (2008) 43--48.
Abstract: We give a synthetic proof of C. F. Parry's theorem that
the reflections in the sidelines of a triangle of three parallel lines
through the vertices are concurrent if and only if they are parallel
to the Euler line, the point of concurrency being the Parry reflection point.
We also show that the Parry reflection point is common to a triad of circles
associated with the tangential triangle and the triangle of reflections (of
the vertices in their opposite sides). A dual result is also given.