Affiliation: | (1) School of Mathematics, University of Southampton, Southampton, SO17 1BJ, United Kingdom;(2) School of Computational and Applied Mathematics, University of the Witwatersrand, Private Bag 3, Wits 2050, Johannesburg, South Africa;(3) School of Mechanical, Industrial and Aeronautical Engineering, University of the Witwatersrand, Provate Bag 3, Wits 2050, Johannesburg, South Africa |