1. Department of Physics, Materials Research Institute (IIM) at the Michoacan University of Saint Nicholas of Hidalgo (UMSNH), Morelia, Michoacan, Mexico
2. Department of Environment, Research Centre for Energy, Environment and Technology (CIEMAT), Madrid, Spain
3. Department of Physics, Research Centre for Applied Science and Advanced Technology (CICATA) at the National Polytechnic Institute (IPN), Mexico City, Mexico
4. Department of Geology, National Museum of Natural History (MNCN) at the Spanish Research Council (CSIC), Madrid, Spain