Ala’ N. Abdullah, Hashim A. Kashkool 2022. The Error Analysis of the Weak Galerkin Finite Element Method for Two-Dimensional Incompressible Immiscible Displacement in Porous Media. Mathematical Statistician and Engineering Applications. 71, 4 (Sep. 2022), 3121–3156. DOI:https://doi.org/10.17762/msea.v71i4.871.