1. Center for Research and Development in Mathematics and Applications (CIDMA), Department of Mathematics; University of Aveiro; Aveiro 3810-193 Portugal
2. Faculty of Computer Science; Białystok University of Technology; Białystok, 15-351 Poland
3. Algoritmi R&D Center, Department of Production and Systems, Campus de Gualtar; University of Minho; Braga 4710-057 Portugal