1. Leartiker S. Coop., Xemein etorbidea 12; 48270 Markina-Xemein Spain
2. Materials + Technologies’ Group, Chemical & Environmental Engineering Dep, Engineering College of Gipuzkoa, University of the Basque Country UPV/EHU; Pza. Europa 1. 20018 Donostia-San Sebastián Spain