Sertan Girgin Faruk Polat Reda Alhajj Positive Impact of State Similarity on Reinforcement Learning Performance. 1256-1270 2007 37 IEEE Transactions on Systems, Man, and Cybernetics, Part B 5 http://doi.ieeecomputersociety.org/10.1109/TSMCB.2007.899419 db/journals/tsmc/tsmcb37.html#GirginPA07