(en) Abraham A. Ungar, « Hyperbolic Barycentric Coordinates », The Australian Journal of Mathematical Analysis and Applications, vol. 6, no 1, , p. 1-35 (lire en ligne)
apmep.fr
François Rideau, « Le Savant Cosinus », Bulletin de l'APMEP, (lire en ligne)
arxiv.org
(en) L. Felipe Prieto-Martinez, Raquel Sanchez-Cauce, « Generalization of Kimberling’s concept of triangle center for other polygons », Arxiv, (lire en ligne)
(en) Clark Kimberling, « Triangle centers » (consulté le ) : « Unlike squares and circles, triangles have many centers. The ancient Greeks found four: incenter, centroid, circumcenter, and orthocenter. A fifth center, found much later, is the Fermat point. Thereafter, points now called nine-point center, symmedian point, Gergonne point, and Feuerbach point, to name a few, were added to the literature. In the 1980s, it was noticed that these special points share some general properties that now form the basis for a formal definition of triangle center »
(en) Clark Kimberling, « Triangle centers as functions », The Rocky Mountain Journal of Mathematics, vol. 23, no 4, , p. 1269-1286 (lire en ligne), p. 1274
springer.com
(en) Abraham A. Ungar, « Hyperbolic Triangle Centers: The Special Relativistic Approach », Springer Science & Business Media, (lire en ligne)