A mixed shell formulation accounting for thickness strains and finite strain 3d material models

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Treatment of Reissner–Mindlin shells with kinks without the need for drilling rotation stabilization in an isogeometric framework (2014, background): “The reference Lagrange-based Reissner–Mindlin shell element formulation [29] is of order p = 1 and describes rotations similar to concept a).”
An isogeometric Reissner–Mindlin shell element based on Bézier dual basis functions: Overcoming locking and improved coarse mesh accuracy (2020, background): “Prominent among these approaches are mixed formulations based on generalized variational principles [6, 7, 8] with displacement, strain and/or stress unknowns, the reduced and selective integration techniques [9, 10, 11], the assumed strain method [12, 13, 14, 15, 16, 17], and the enhanced assumed s”
Isogeometric Reissner–Mindlin shell analysis with exactly calculated director vectors (2013, background): “The terminology is in some points altered to be suitable to the shell formulation which follows [9].”