1. RNASA-IMEDIR, Computer Science Faculty, University of A Coruna, 15071 A Coruna, Spain
2. Department of Organic and Inorganic Chemistry, University of Basque Country UPV/EHU, 48940 Leioa, Spain
3. Department of Condensed Matter Physics, University of Basque Country UPV/EHU, 48940 Leioa, Spain
4. LAQV@REQUIMTE, Department of Chemistry and Biochemistry, University of Porto, 4169-007 Porto, Portugal