1. Departamento de Matemática Aplicada, University of Granada, 18071 Granada, Spain
2. IMATI CNR, Pavia, Italy
3. School of Engineering, Institute for Multiscale Thermofluids, University of Edinburgh, Edinburgh, UK
4. Department of Mathematics, University of Houston, Houston, TX 77204, USA
5. Department of Civil Engineering and Architecture, University of Pavia, Pavia, Italy