1. Faculty of Exact Sciences and Technologies, Universidad Nacional de Santiago del Estero, Santiago del Estero, Argentina
2. Artificial Intelligence R&D Laboratory, Department of Computer Science and Engineering Universidad Nacional del Sur, Bahía Blanca, Argentina. E-mail: pdb@cs.uns.edu.ar
3. Argentine National Council of Scientific and Technical Research (CONICET), Buenos Aires, Argentina. E-mails: escanuela@famaf.unc.edu.ar, mcdb@cs.uns.edu.ar
4. Institute for Computer Science and Engineering (CONICET-UNS), Buenos Aires-Bahía Blanca, Argentina
5. Institute for Computer Science Research (CONICET-UBA), Buenos Aires, Argentina
6. Department of Computer Science, Universidad de Buenos Aires (UBA), Buenos Aires, Argentina. E-mail: mvm@cs.uns.edu.ar
7. Department of Computer Science and Engineering, Universidad Nacional del Sur (UNS), Buenos Aires-Bahía Blanca, Argentina. E-mail: grs@cs.uns.edu.ar