1. Departamento de Física; EPS Campus Rio Vena - Universidad de Burgos; Burgos Spain
2. Laboratorio Interinstitucional de Magnetismo Natural, Instituto de Geofísica Unidad Michoacán; UNAM - Campus Morelia; Morelia México
3. Alexandre Janelidze Institute of Geology; Ivane Javakhishvili Tbilisi State University; Tbilisi Georgia
4. Institute of Geology of Ore Deposits; Petrography, Mineralogy and Geochemistry - Russian Academy of Sciences (IGEM RAS); Moscow Russia