Hölscher, Christian, Detmar Zimmer, Jan Henning Keßler, Martin Kruger, and Ansgar Trächtler. “Hierarchical Optimization of Coupled Self-Optimizing Systems.”https://doi.org/10.1109/INDIN.2012.6301199__In IEEE International Conference on Industrial Informatics, 10:1080–85. Industrial Informatics (INDIN), 2012.https://doi.org/10.1109/INDIN.2012.6301199 .