Acknowledgments: The German Research Chair at AIMS Rwanda expresses his gratitude for the appointment, financing, and overall support provided by the Alexander von Humboldt Foundation. The chair also expresses his indebtedness to the German Academic Exchange Service (DAAD) for the generous financial support provided for research and academic exchange, and scholarship cooperation with Professor Pu Li, Institute for Automation and Systems Engineering, Technical University of Ilmenau, Germany. I am acknowledging the Department of Mathematics, College of Sciences and Technology –UR who supported this workshop by providing a workshop room. Moreover, without the highly supportive, well-coordinated, and amicable administrative team at AIMS Rwanda, this workshop could not have been a reality within such a short time. Specifically, I would like to express my gratefulness to the AIMS Rwanda center president Prof. Sam Yala, and Mrs. Carine Umulisa, Research Coordinator at AIMS Rwanda, who have been of great help during the organization of the workshop.