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3. L. Gallego O. Duarte, H. Torres, et al., Fuzzy risk analysis due to lightning in Colombia, ICLP 2002, Cracow, Poland, September 2–6, 2002.
4. H. Torres, L. Gallego, et al., Ground stroke density in tropical zone, Proceedings of ISH 2001, International Symposium on High Voltage, Bangalore, India, 2001.
5. H. Torres, L. Gallego, et al., Variation of ground stroke density with latitude, Proceedings of VI SIPDA, VI International Symposium on Lightning Protection, Santos, Brazil, November 19–23, 2001.