Wave dispersion in gradient elastic solids and structures: A unified treatment

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Isogeometric analysis for sixth-order boundary value problems of gradient-elastic Kirchhoff plates (2017, background): “In particular, relation (36) and Figure 4 in [63] clearly reveal that γ = 0 implies physically unacceptable unbounded wave velocities for high wavenumbers or frequencies.”
Analysis of micro-sized beams for various boundary conditions based on the strain gradient elasticity theory (2012, methodology): “After this, modified couple stress, non-local elasticity, and strain gradient elasticity theories have been widely applied to static and dynamic analysis of beams [18–28], plates [29,30] and other type structures [31–33].”
Variational formulation and isogeometric analysis for fourth-order boundary value problems of gradient-elastic bar and plane strain/stress problems (2016, methodology): “lead to fourth-order governing equations [12, 13].”