On Centers and Central Lines of Triangles in the Elliptic Plane
  We determine barycentric coordinates of triangle centers in the elliptic
plane. The main focus is put on centers that lie on lines whose euclidean limit
(triangle excess --> 0) is the Euler line or the Brocard line. We also
investigate curves which can serve in elliptic geometry as substitutes for the
euclidean nine-point-circle, the first Lemoine circle or the apollonian
circles.
