1. Stelar srl; 27035 Mede PV Italy
2. JEOL (ITALIA) S.p.A.; Palazzo Pacinotti-Milano 3 City, Via Ludovico il Moro 6/A 20080 Basiglio MI Italy
3. Physique de la Matière Condensée; Ecole Polytechnique-CNRS; 91128 Palaiseau France
4. Institute for Environmental Sciences, Department of Soil and Environmental Chemistry; University of Koblenz-Landau; Landau 76829 Germany
5. Dipartimento di Scienze Agrarie e Forestali; Università degli Studi di Palermo; 90128 Palermo Italy