Fractional Fokker-Planck equation for anomalous diffusion in a potential: Exact matrix continued fraction solutionsW.T. Coffey, Y.P. Kalmykov and S.V. TitovEur. Phys. J. Special Topics, 222 8 (2013) 1847-1856DOI: https://doi.org/10.1140/epjst/e2013-01968-x