Todor Zaharinov, Orthopoles, flanks, and Vecten points,
Forum Geometricorum, 17 (2017) 401--410.
Abstract. Erect a square outwardly (or inwardly) from each side of the
triangle. For the flank lines construct orthopoles. The lines from
this orthopoles to corresponding vertexes of triangle concur in
the Vecten point (or in the Inner Vecten point). This fact is
showing together with a number of other interesting results, which
include complex coordinates of Vecten points and orthopole.
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