1 Department of Computer Science, University of Cyprus, P.O. Box 20537, Nicosia, 1678, Cyprus. Electronic address: cchrist@ucy.ac.cy.
2 Department of Mathematical Sciences, Politecnico di Torino, 10129, Turin, Italy. Electronic address: giuseppe.donofrio@polito.it.
3 Computing & Software Systems Division, School of STEM, University of Washington Bothell, Bothell, WA, 98011, USA. Electronic address: stiber@uw.edu.
4 Neuroheuristic Research Group, Complexity Science Research Center, Université de Lausanne, CH 1015, Lausanne, Switzerland. Electronic address: Alessandro.Villa@unil.ch.