Jie Wang Weijun Zhong Jun Zhang 0001 A general meshsize fourth-order compact difference discretization scheme for 3D Poisson equation. 804-812 2006 183 Applied Mathematics and Computation 2 http://dx.doi.org/10.1016/j.amc.2006.06.028 db/journals/amc/amc183.html#WangZZ06a