Matrix approach to discrete fractional calculus III: Non-equidistant grids, variable step length and distributed orders
Podlubny, I., T. Skovranek, B.M. Vinagre Jara, I. Petras, V. Verbitsky, and Y.Q. Chen. 2013. “Matrix Approach to Discrete Fractional Calculus III: Non-Equidistant Grids, Variable Step Length and Distributed Orders”. Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 371 (1990).