Raulin, J. P., Correia de Matos, D. P., Hadano, R., Saraiva, C. V., Correia, E., & Kaufmann, P. (2009). The south America VLF NETwork (SAVNET): Development, installation status, first results. Geofisica Internacional, 48(3), 253–261. https://doi.org/10.22201/igeof.00167169p.2009.48.3.24