Discrete fractional calculus: Non-equidistant grids and variable step length
Podlubny, I., T. Skovranek, I. Petras, V.V. Verbickij, Y Chen, and B.M.V. Jara. 2011. “Discrete fractional calculus: Non-equidistant grids and variable step length”. In Proceedings of the ASME Design Engineering Technical Conference, 3:211-17.