1. Department of Statistics and Operations Research; University of Seville; Seville Spain
2. IMUS - Mathematics Institute of the University of Seville; Seville Spain
3. BCAM - Basque Center for Applied Mathematics; Bilbao Spain
4. Department of Differential Equations and Numerical Analysis; University of Seville; Seville Spain
5. Abengoa Solar New Technologies; Seville Spain