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. Incenters and Excenters: 10693. The American Mathematical Monthly, 107(2):182-184, 2000. [doi]
Abstract is missing.