Terence L. van Zyl Matthew Woolway Andrew Paskaramoorthy ParDen: Surrogate Assisted Hyper-Parameter Optimisation for Portfolio Selection. 101-107 2021 ISCMI https://doi.org/10.1109/ISCMI53840.2021.9654934 conf/iscmi/2021 db/conf/iscmi/iscmi2021.html#ZylWP21 streams/conf/iscmi