@TechReport{MertziosSauZaksAIB0906,
author =     "George B. Mertzios and Ignasi Sau and Shmuel Zaks",
title =     "The Recognition of Tolerance and Bounded Tolerance Graphs is NP-complete",
institution =     "RWTH Aachen",
year =     "2009",
number =     "AIB-2009-06",
month =     "April",
url =          "http://aib.informatik.rwth-aachen.de/2009/2009-06.pdf"
}