1. SCAI, NIR/MIR Spectroscopy Unit, Ramón y Cajal Building; Campus of Rabanales, University of Córdoba; E-14071; Córdoba; Spain
2. Chemistry Department, Plaza Misael Bañuelos; s/n, University of Burgos; Burgos; Spain
3. Mathematics and Computation Department; Plaza Misael Bañuelos, s/n, University of Burgos; Burgos; Spain