d	De Longchamps ellipse
r139	cevian quotient, Gergonne point, incenter
r147	Nagel point, orthocenter, circumcenter, Mittenpunkt, De Longchamps point, point X(84)
r156	Mannheim circles, incenter, circumcenter
r168	excentral triangle, intouch triangle, homothetic triangles
r279	Mittenpunkt, centroid, Gergonne point, complement
r284	intouch triangle, orthic triangle, homothetic triangles
r367	centroid, Mittenpunkt, isogonal points, desmic structure
r668	intouch triangle, perspective,incircle, tangent circles
r669	incircle, tangent circles, radical center
r744	incenter, excenters, point X(173)
r751	perspective, intouch triangle, Gergonne point
r1138	circumcircle, incircle, circumcevian triangle, point X(55)
r1594	incenter, point X(55), point X(165)
r1805	incenter, circumcircle, Mannheim circles