Tilfani O., Krištoufek Ladislav, Ferreira P., El Boukfaoui M. Y. :  Heterogeneity in economic relationships: Scale dependence through the multivariate fractal regression , Physica. A : Statistical Mechanics and its Applications vol.588, 126530 [2022] Download Download DOI: 10.1016/j.physa.2021.126530