Ervin, Vincent J., and John Paul Roop. “Variational Formulation for the Stationary Fractional Advection Dispersion Equation”. Numerical Methods for Partial Differential Equations, vol. 22, no. 3, 2006, pp. 558-76, https://doi.org/10.1002/num.20112.
Ervin, V. J., & Roop, J. P. (2006). Variational formulation for the stationary fractional advection dispersion equation. Numerical Methods for Partial Differential Equations, 22(3), 558-576. https://doi.org/10.1002/num.20112
Ervin VJ, Roop JP. Variational formulation for the stationary fractional advection dispersion equation. Numerical Methods for Partial Differential Equations. 2006;22(3):558-76.