1. Kimberling, C.: Bicentric pairs. https://faculty.evansville.edu/ck6/encyclopedia/BicentricPairs.html
2. Kimberling, C.: Encyclopedia of Triangle Centers—ETC. https://faculty.evansville.edu/ck6/encyclopedia/ETC.html
3. Kimberling, C.: Functional equations associated with triangle geometry. Aequationes Mathematicae 45, 127–152 (1993)
4. Kimberling, C.: Triangle centers and central triangles. Congressus Numerantium 129, 1–295 (1998)
5. Moses, P.J.C.: Central lines. https://faculty.evansville.edu/ck6/encyclopedia/CentralLines.html