Technische Universität Kaiserslautern - Technomathematics Group, MSU-Iligan Institute of Technology, University of Trier - Faculty of Economics, MSU-Iligan Institute of Technology, MSU-Iligan Institute of Technology, Science Education Institute, Philippines, MSU-Iligan Institute of Technology, MSU-Iligan Institute of Technology, MSU-Iligan Institute of Technology, MSU-Iligan Institute of Technology, MSU-Iligan Institute of Technology, MSU-Iligan Institute of Technology and MSU-Iligan Institute of Technology