Arbitrarily smooth generalized finite element approximations

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A generalized finite element method with global-local enrichment functions for confined plasticity problems (2012, background): “Further details can be found in many references, for example, [3, 10, 15, 19, 27].”
A face‐based smoothed finite element method (FS‐FEM) for 3D linear and geometrically non‐linear solid mechanics problems using 4‐node tetrahedral elements (2009, methodology): “[22] by combining C0 Lagrange FE shape functions with the proposed Ck partition of unity to give a so-called arbitrary smooth generalized finite element approximation (Ck GFEM).”
An efficient augmented finite element method for arbitrary cracking and crack interaction in solids (2014, methodology): “Another important class of numerical methods is the partition-of-unity (PoU)-based finite element methods [7], including the generalized finite element method (G-FEM) [8–11], extended finite element method (X-FEM) [12–20] and the phantom node method (PNM) [21–27].”
Analysis of Interacting Cracks Using the Generalized Finite Element Method With Global-Local Enrichment Functions (2008, background): “[17] C.”