Ethan Burns Seth Lemons Wheeler Ruml Rong Zhou Suboptimal and Anytime Heuristic Search on Multi-Core Machines. 2009 ICAPS conf/aips/2009 db/conf/aips/icaps2009.html#BurnsLRZ09 http://aaai.org/ocs/index.php/ICAPS/ICAPS09/paper/view/744