Cyril De Fillon Alberto Bartoli Symbolic regression of discontinuous and multivariate functions by Hyper-Volume Error Separation (HVES). 23-30 2007 IEEE Congress on Evolutionary Computation http://dx.doi.org/10.1109/CEC.2007.4424450 conf/cec/2007 db/conf/cec/cec2007.html#FillonB07