Dogan, Abdulkadir2020-02-042020-02-0420150893-965910.1016/j.aml.2015.05.004https://hdl.handle.net/20.500.12573/110The author would like to thank the anonymous referees and editor for their helpful comments and suggestions. The project was supported by Abdullah Gul University Foundation of Turkey (Project No. 5).This paper is concerned with the existence of positive solutions to a second order boundary value problem. By imposing growth conditions on f and using a generalization of the Leggett-Williams fixed point theorem, we prove the existence of at least three symmetric positive solutions. (C) 2015 Elsevier Ltd. All rights reserved.enginfo:eu-repo/semantics/openAccessBoundary value problemGreen's functionMultiple solutionFixed point theoremarticle10.1016/j.aml.2015.05.004