1. G. I. Barenblatt. Scaling, self-similarity, and intermediate asymptotic. Cambridge University Press, Cambridge (1996).
2. V. G. Danilov and G. O. Omelyanov. Dynamics of the interface between two immiscible liquids with nearly equal densities under gravity. European Journal of AppliedMathematics, 13 (2002), 497–516.
3. M. A. Hesse, H. A. Tchelepi, B. J. Cantwell and F. M. Orr Jr. Gravity currents in horizontal porous layers: transition from early to late self-similarity. J. Fluid. Mech., 577 (2007), 363–383.
4. H. Kalisch, D. Mitrovic and J. M. Nordbotten. Rayleigh-Taylor instability of immiscible fluids in porous media. Continuum Mech. Thermodyn. DOI 10. 1007/ s00161-014-0408z.
5. L. Lake. Enhanced oil recovery. Prentice Hall, Englewood Cliffs (1989).