Michael L. Hall, and Jim E. Morel. A Second-Order Cell-Centered Diffusion Differencing Scheme for Unstructured Hexahedral Lagrangian Meshes. In Proceedings of the 1996 Nuclear Explosives Code Developers Conference (NECDC), UCRL-MI-124790, pages 359-375, San Diego, CA, October 21-25 1996. LA-UR-97-8.which is an extension of
J. E. Morel, J. E. Dendy, Jr., Michael L. Hall, and Stephen W. White. A Cell-Centered Lagrangian-Mesh Diffusion Differencing Scheme. Journal of Computational Physics, 103(2):286-299, December 1992.to 3-D unstructured meshes, with an alternate derivation.
Mikhail Shashkov and Stanly Steinberg. Solving Diffusion Equations with Rough Coefficients in Rough Grids. Journal of Computational Physics, 129:383-405, 1996.to 3-D unstructured meshes, with an alternate derivation.