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Long-Memory and Fractal Traces in KHz-MHz Electromagnetic Time Series Prior to the ML=6.1, 12/6/2007 Lesvos, Greece Earthquake: Investigation through DFA and Time-Evolving Spectral Fractals
J Earth Sci Clim Change. 9:4, (2018)
https://doi.org/10.4172/2157-7617.1000465