1. Department of Computer Science, School of Computing and Engineering, University of Huddersfield, HD4 6DJ Huddersfield, UK
2. Centre for Computational Science and Mathematical Modelling, Coventry University, Coventry CV1 2TU, UK
3. Physics Department, Solid State Physics Section, National and Kapodistrian University of Athens, Panepistimiopolis Zografos, Athens 157 84, Greece
4. Department of Electrical and Computer Engineering, University of Thessaly, 38221 Volos, Greece
5. Department of Materials, Imperial College London, London SW7 2BP, UK