Sung Wook Yoon Alan Fern Robert Givan Using Learned Policies in Heuristic-Search Planning. 2047-2053 2007 conf/ijcai/2007 IJCAI http://dli.iiit.ac.in/ijcai/IJCAI-2007/PDF/IJCAI07-330.pdf db/conf/ijcai/ijcai2007.html#YoonFG07