1. Cinvestav Unidad Saltillo, Apartado Postal 663, 25900 Ramos Arizpe, Coahuila, Mexico
2. Centro de Investigación en Química Aplicada, 25294 Saltillo, Coahuila, Mexico
3. Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 1410, 50-950 Wroclaw, Poland
4. Department of Nuclear Engineering, University of Tennessee, Knoxville, Tennessee 37996, United States
5. Department of Geological Sciences, Stanford University, Stanford, California 94305, United States
6. Facultad de Farmacia, Departamento de Química, Universidad San Pablo-CEU, CEU Universities, Urbanización Montepríncipe, Boadilla del Monte, E-28668 Madrid, Spain