Berndt Schmidt Johann Reger ℋ∞-suboptimal Tracking Control for Bilinear Power Systems with Dynamic Feedback - Theory and Experiment. 578-584 2010 CCA http://dx.doi.org/10.1109/CCA.2010.5611227 conf/IEEEcca/2010 db/conf/IEEEcca/IEEEcca2010.html#SchmidtR10