Nicos G. Pavlidis Vassilis P. Plagianakos Dimitris K. Tasoulis Michael N. Vrahatis Human Designed Vs. Genetically Programmed Differential Evolution Operators. 1880-1886 2006 IEEE Congress on Evolutionary Computation https://doi.org/10.1109/CEC.2006.1688536 conf/cec/2006 db/conf/cec/cec2006.html#PavlidisPTV06