@ARTICLE{Kubalik2021SymbolicRegressionMethods, author="Kubal\'ik, Ji\v{r}\'i and \v{Z}egklitz, Jan and Derner, Erik and Babu\v{s}ka, Robert", title={Symbolic Regression Methods for Reinforcement Learning}, journal = {IEEE Access}, volume = {9}, pages = {139697--139711}, year = {2021} }