Hayri Ardal Ján Manuch Moshe Rosenfeld Saharon Shelah Ladislav Stacho The Odd-Distance Plane Graph. 132-141 2009 42 Discrete & Computational Geometry 2 http://dx.doi.org/10.1007/s00454-009-9190-2 db/journals/dcg/dcg42.html#ArdalMRSS09