1. CONFIRM Centre for SMART Manufacturing, University of Limerick, Limerick, Ireland
2. MACSI, Department of Mathematics and Statistics, University of Limerick, Limerick, Ireland
3. Department of Mathematics, Universiti Pertahanan Nasional Malaysia, Kuala Lumpur, Malaysia
4. Faculty of Computing and Informatics, Universiti Malaysia Sabah, Kota Kinabalu, Malaysia