W. G. Gray,  P. A. Herrera,  S. E. Gasda & H. K. Dahle. (2019). Derivation of Vertical Equilibrium Models for $\rm{CO}_2$ Migration from Pore Scale Equations.
            <i>International Journal of Numerical Analysis and Modeling</i>. <i>9</i> (3).
            745-776.
         doi: