. 2017 Nov 22;30(2):389–411. doi: 10.1007/s00521-017-3284-1
© The Author(s) 2017
Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
Fig. 4.
Convex Pareto front (a) and non-convex Pareto front (b)