Kimberling, C. "Central Points and Central Lines in the Plane of a Triangle." Math. Mag.67, 163-187, 1994.Kimberling,
C. "Triangle Centers and Central Triangles." Congr. Numer.129,
1-295, 1998.Kimberling, C. "Exeter Point." http://faculty.evansville.edu/ck6/tcenters/recent/exeter.html.Kimberling,
C. "Encyclopedia of Triangle Centers: X(22)=Exeter Point." http://faculty.evansville.edu/ck6/encyclopedia/ETC.html#X22.Kimberling,
C. and Lossers, O. P. "Problem 6557 and Solution." Amer. Math.
Monthly97, 535-537, 1990.
to be the point (other than the polygon vertex 
) where the triangle
median through 
meets the circumcircle of 
, and define 
and 
similarly. Then the Exeter point is the perspector
of the triangle 
and the tangential
triangle. It has triangle center function
.
