r147	Nagel point, orthocenter, circumcenter, Mittenpunkt, De Longchamps point, point X(57)
r148	excenters, circumcenter
r502	circumcircle, incenter, excenters, orthocenter, circumcenter
r595	excenters, circumcenter, Bevan point, De Longchamps point, isogonal points, desmic structure
r641	extouch triangle, circumcenter, Bevan point
r739	incenter, excentral triangle, orthocenter, circumcenter, Bevan point, Mittenpunkt, Prasolov point, point X(64)
r1456	excenters
r1765	altitudes
r1956	excenters, circumcircle, excircles, homothetic triangles
r2014	incenter, orthocenter, orthologic triangles