Nonlinear boundary value problems with concave nonlinearities near the origin

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On Clark's theorem and its applications to partially sublinear problems (2015, unknown): “This idea was first explored in [19] for a variety of nonlinear boundary value problems.”
Remarks on the 2-Dimensional Lp-Minkowski Problem (2010, background): “3) at infinity and 0, respectively, we refer to [18,22,23] if g is negative and to [11-13] if g is sign-changing.”
Nontrivial solutions of superlinear p-Laplacian equations (2009, background): “(iii) In addition to ( f 3), ( f 4) and ( f 5) ,i ff (x, t) is odd in t for small |t|, then infinitely many solutions of the problem (1.1) were obtained by Wang [ 17, Theorem 2.10 ].”
Ljusternik-Schnirelman theory in partially ordered Hilbert spaces (2002, methodology): “Using the method of [48], we may only need that (f1) is satisfied for |t| small in a neighborhood of t = 0.”
Solutions to Semilinear Elliptic Problems with Combined Nonlinearities (2002, background): “1) was also studied by Wu and Yang in [29] for the case where f ðx; uÞ lu gðx; uÞ; l is a constant and gðx; uÞc0 is sublinear globally in u: Moreover, Wang in [28] proved that problem (1.”