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3. Aranguren, D., Aponte, J.C., Romero, J., Guevara, M., Torres, H., Baquero, G., Pérez, E., Rondón, D., ''Design, construction and calibration of two e-field machines used to measure tropical thundercloud e-field on the ground and aloft''. VIII International Symposium on Lightning Protection, Sao Paulo, Brazil, pages 184-189, 21st-25th November 2005.
4. EN50536 Std., Protection against lightning. Thunderstorm warning systems, European Committee for Electrotechnical Standardization, 2010.
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