@ARTICLE{Modares2016OptimalModelFree,
author = {H. Modares and S.P. Nageshrao and G.A.D. Lopes and R. Babu\v{s}ka and F.L. Lewis},
title={Optimal model-free output synchronization of heterogeneous systems using off-policy reinforcement learning},
journal={Automatica},
volume={71},
pages={334--341},
year={2016}
}