1. School of Information and Physical Sciences, University of Newcastle, Callaghan, Australia
2. Mathematics Department, Khurmah University College, Taif University, Taif, KSA
3. National Institute for Applied Statistics Research Australia (NIASRA), University of Wollongong, Wollongong, Australia
4. Centre for Multi-Dimensional Data Visualisation (MuViSU), Stellenbosch University, Stellenbosch, South Africa