Chaparro, M. A. E., Sinito, A. M., Bidegain, J. C., & de Barrio, R. E. (2006). Magnetic studies of natural goethite samples from Tharsis, Huelva, Spain. Geofísica Internacional, 45(4), 219–230. https://doi.org/10.22201/igeof.00167169p.2006.45.4.159