Advantages of the mixed format in geometrically nonlinear analysis of beams and shells using solid finite elements

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Unified formulation of geometrically nonlinear refined beam theories (2018, methodology): “[42] addressed the geometrically nonlinear analysis of beams and shells using solid finite elements and highlighted the advantages of mixed stress/displacement formulations when applied to the path-following analysis and Koiter asymptotic method.”
An efficient mixed variational reduced‐order model formulation for nonlinear analyses of elastic shells (2018, background): “A more recent work [20] observed the beneficial convergence properties of mixed model formulations in a general context, extendible to displacement-based finite element formulations following the mixed integration points strategy proposed in [21].”