Introducing fractal dimension algorithms to calculate the Hurst exponent of financial time seriesM.J. Sánchez-Granero, M. Fernández-Martínez and J.E. Trinidad-SegoviaEur. Phys. J. B, 85 3 (2012) 86DOI: https://doi.org/10.1140/epjb/e2012-20803-2