Cervantes de la Torre, F., A. Ramírez-Rojas, C. Pavía-Miller, F. Angulo-Brown, E. Yépez, ., and J. Peralta. “A Comparison Between Spectral and Fractal Methods in Electrotelluric Time Series”. Revista Mexicana De Física, vol. 45, no. 3, Jan. 1999, pp. 298-02, https://rmf.smf.mx/ojs/index.php/rmf/article/view/2863.