Update on a class of gradient theories

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Long-range cohesive interactions of non-local continuum faced by fractional calculus (2008, background): “For a review of the recent developments in gradient theories see Aifantis (2003) and references cited therein.”
Analysis of micro-sized beams for various boundary conditions based on the strain gradient elasticity theory (2012, background): “After the study proposed by Koiter [6], some other researchers have made some development on this theory [4,7–13].”
Longitudinal vibrations of nano-rods by stress-driven integral elasticity (2019, methodology): “These gradient theories of elasticity were then extended to the following size-dependent models as, unified gradient elasticity theory [16]–[18], higher-order gradient Eringen model [19], nonlocal strain elasticity theory [20], [21] and nonlocal-couple stress elasticity theory [22], [23].”
Gradient elasticity in statics and dynamics: An overview of formulations, length scale identification procedures, finite element implementations and new results (2011, background): “(29), that is taking g1 – 0 and g2 – 0, has recently been discussed by Aifantis (2003) and shown to be able to eliminate singularities from stress and strain fields.”