Unger, J. Marshall, A new proof of a "hard but important'' Sangaku problem. Forum Geom. 10 (2010), 7?13.
Prof. Unger specializes in Japanese. The paper deals with some Sangaku problem in plane geometry. But when he was asking mathematicians where to publish something in plane geometry, we really knew no place. Until this one came to light. This journal is published at Florida Atlantic University.