AHADI, S.; PUSPITO, N. T.; IBRAHIM, G.; SAROSO, S.; YUMOTO, K.; MUZLI, M. Anomalous ULF Emissions and Their Possible Association with the Strong Earthquakes in Sumatra, Indonesia, during 2007-2012. Journal of Mathematical and Fundamental Sciences, v. 47, n. 1, p. 84-103, 1 Apr. 2015.