Incenters and Excenters: 10693. - Wu Wei Chao; Michael Reid; F. Bellot Rosado; Robin J. Chapman; Daniele Donini; Shalosh B. Ekhad; N. Lakshmanan; O. P. Lossers; Albert Nijenhuis; Peter Nüesch; C. G. Petalas (Am. Math. Mon., 2000)

A Bisector Inequality: 11337 [2008, 71]. - Marian Tetiva; Peter Nüesch (Am. Math. Mon., 2009)