Positive solutions and nonlinear eigenvalue problems for retarded second order differential equations by George L. Karakostas, P. Ch Tsamatos

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Boundary value problems with solutions in convex sets by Gerd Herzog, Peer Chr. Kunstmann

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Existence of solutions of nonlinear third-order two-point boundary value problems by Petio Kelevedjiev, Todor Todorov

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On the Solvability of Fourth-Order Two-Point Boundary Value Problems by Ravi P. Agarwal, Petio S. Kelevedjiev

Subjects: “…positive or non-negative, monotone, convex or concave solutions…”
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Unbounded solutions of an iterative-difference equation by Li Lin, Zhang Pingping

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