The Existence of Periodic and Subharmonic Solutions of Subquadratic Second Order Difference Equations

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Periodic Solutions of Second Order Self‐Adjoint Difference Equations (2005, background): “1) was discussed in two recent papers [15, 16].”
Boundary value problems of discrete generalized Emden-Fowler equation (2006, unknown): “[14,15,18,19,21,22,27–29]. In two recent papers [16, 17 ] , the authors”
Subharmonic Solutions with Prescribed Minimal Period of a Discrete Forced Pendulum Equation (2004, background): “See, for example, [2,7,15,17] for results on disconjugacy and [10, 11 ] for results on the existence of periodic and subharmonic solutions.”
Existence of Periodic and Subharmonic Solutions for Second-Order p-Laplacian Difference Equations (2007, background): “1) depends on xn+1 and xn−1, the traditional ways of establishing the functional in [2–7] are inapplicable to our case.”