References

1. G.S. Beavers and D.D. Joseph, “Boundary Conditions at a Naturally Permeable Wall,” J. Fluid Mech., vol. 30, 1967.

2. P.G. Saffman, “On the Boundary Condition at the Surface of a Porous Medium,” Stud. Appl. Maths, vol. 50, 1971.