Robert Fitch Bernhard Hengst Dorian Suc Gregory Calbert Jason B. Scholz Structural Abstraction Experiments in Reinforcement Learning. 164-175 2005 conf/ausai/2005 Australian Conference on Artificial Intelligence http://dx.doi.org/10.1007/11589990_19 db/conf/ausai/ausai2005.html#FitchHSCS05