Imre Bárány, Edgardo Roldán-Pensado. On a forgotten conjecture from a famous paper of Erdös. In Guilherme Dias da Fonseca, Thomas Lewiner, Luis Mariano Peñaranda, Timothy Chan, Rolf Klein, editors, Symposuim on Computational Geometry 2013, SoCG '13, Rio de Janeiro, Brazil, June 17-20, 2013. pages 77-80, ACM, 2013. [doi]