Edwards, M. G., & Zheng, H. (2010). Double-families of quasi-positive Darcy-flux approximations with highly anisotropic tensors on structured and unstructured grids. Journal of Computational Physics, 229(3), pp. 594-625. doi:10.1016/j.jcp.2009.09.037

Edwards, Michael G., and Hongwen Zheng. "Double-families of Quasi-positive Darcy-flux Approximations With Highly Anisotropic Tensors On Structured and Unstructured Grids." Journal of Computational Physics 229, no. 3 (2010): 594-625.

Edwards, Michael G., and Hongwen Zheng. "Double-families of Quasi-positive Darcy-flux Approximations With Highly Anisotropic Tensors On Structured and Unstructured Grids." Journal of Computational Physics 229.3 (2010): 594-625.