Affiliation: | 1.School of Mechanical, Industrial and Aeronautical Engineering, University of the Witwatersrand, Johannesburg, South Africa ;2.CFisUC - The Centre for Physics of the University of Coimbra, University of Coimbra, Coimbra, Portugal ;3.DSI-NRF Centre of Excellence in Strong Materials, hosted by the University of the Witwatersrand, Johannesburg, South Africa ; |