In the paper "Prediction of steady state flow in nonuniform geologic media by conditional moments: Exact nonlocal formalism, effective conductivities, and weak approximation" by Shlomo P. Neuman and Shlomo err (Water Resources Research, 29(2) 341-364, 1993) the authors developed a nonlocal formalism for steady state flow in randomly heterogeneous porous media by conditional moments. They considered the steady state flow equation and boundary conditions
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