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Unger, J. Marshall
A new proof of a hard but important Sangaku problem, 10 (2010) 7--13.
Kitta's double-locked problem, 14 (2014) 43--50.
Solutions of two Japanese ellipse problems, 16 (2016) 85--94.

Ustinov, Alexey V.
On the construction of a triangle from the feet of its angle bisectors, 9 (2009) 279--280.