1. Department of Information Engineering, Computational Science and MathematicsUniversità dell'Aquila 67100 L'Aquila Italy
2. Institute of Chemical Sciences and EngineeringÉcole Polytechnique Fédérale de Lausanne Lausanne Switzerland
3. Department of Basic Sciences Applied for Engineering“Sapienza” Università di Roma 00185 Rome Italy
4. Department of Physical and Chemical ScienceUniversità dell'Aquila 67100 L'Aquila Italy