Figueroa, Rubén2017-10-212017-10-212016-10-12Figueroa, R. Bound Value Probl (2016) 2016: 180. https://doi.org/10.1186/s13661-016-0685-5http://hdl.handle.net/10347/16004eng© Figueroa 2016. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were madeFourth-order boundary value problemsDeviating argumentsDiscontinuous equationsLower and upper solutionsjournal article10.1186/s13661-016-0685-51687-2770open access