A Nitsche extended finite element method for incompressible elasticity with discontinuous modulus of elasticity

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Fictitious domain finite element methods using cut elements (2012, methodology): “A related approach was used in [1] to ensure inf-sup stability for an unfitted finite element method for incompressible elasticity.”
CutFEM: Discretizing geometry and partial differential equations (2015, background): “Situations that are particularly sensitive are the imposition of Dirichlet boundary conditions [12, 27], or domain decomposition on unﬁtted meshes, where an inf-sup condition has to be satis-ﬁed, such as for incompressible elasticity [9, 28–31].”
Robust flux error estimation of an unfitted Nitsche method for high-contrast interface problems (2016, unknown): “See for example [2], [22], [8], [11], [16], [14], [4], [9], [5], [18], [17], [23], [7], [3], [21], [1], [19], [15].”
A reduced model for Darcy’s problem in networks of fractures (2014, background): “8, which is in turn based on what introduced in [9], Theorem 3.”
A mixed finite element method for Darcy flow in fractured porous media with non-matching grids (2012, methodology): “Finally, our assumption that ηi is constant on each subdomain Ωi is obviously very restrictive; in the more general case η ∈ Qh, MΓ would also depend on the ratios ηi,max/ηi,min (see [6]).”