Y. Efendiev, J. Galvis, S. Ki Kang and R.D. Lazarov. (2012). Robust Multiscale Iterative Solvers for Nonlinear Flows in Highly Heterogeneous Media.
            <i>Numerical Mathematics: Theory, Methods and Applications</i>. <i>5</i> (3).
            359-383.
         doi:10.4208/nmtma.2012.m1112