The first author gratefully appreciates support from the University of Pretoria postgraduate study abroad bursary programme. The second author gratefully acknowledges financial support provided by the Austrian Academy of Sciences… Click to show full abstract
The first author gratefully appreciates support from the University of Pretoria postgraduate study abroad bursary programme. The second author gratefully acknowledges financial support provided by the Austrian Academy of Sciences in the form of an APART-fellowship at the Automation and Control Institute of Vienna University of Technology. The third author gratefully acknowledges financial support provided by the Austrian Federal Ministry of Science, Research and Economy, and the National Foundation for Research, Technology and Development. The fourth author would like to acknowledge the support of the National Research Foundation of South Africa (Grant No.90533).
               
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