Peter Braß Günter Rote Konrad J. Swanepoel Triangles of Extremal Area or Perimeter in a Finite Planar Point Set. 51-58 2001 26 Discrete & Computational Geometry 1 http://dx.doi.org/10.1007/s00454-001-0010-6 db/journals/dcg/dcg26.html#BrassRS01