George Christakos/Dionissios Hristopoulos: Stochastic Radon operators in
porous medium hydrodynamics. Quart. Appl. Math. 55 (1997), 89-112.
A stochastic differential equation describing the hydrodynamics of
three-dimensional porous media is reduced to a one-dimensional
integro-differential equation involving the generalized space
transformation of the head potential.