Levy models and long correlations applied to the study of exchange traded funds. - Maria C. Mariani; J. D. Libbin; K. J. Martin; E. Ncheuguim; Maria P. Beccar-Varela; V. Kumar Mani; C. A. Erickson; Delia J. Valles-Rosales (Int. J. Comput. Math., 2009)