@article{Tsamatos_2006, title={Double positive solutions for second order nonlocal functional and ordinary boundary value problems}, volume={28}, url={https://apcz.umk.pl/TMNA/article/view/TMNA.2006.023}, abstractNote={In this paper we prove the existence of two positive
solutions for a second order nonlinear functional nonlocal
boundary value problem. The results are obtained by using a fixed
point theorem on a Banach space, ordered by an appropriate cone,
due to Avery and Henderson [< i> Two positive fixed points of nonlinear operators on
ordered Banach spaces< /i> , Comm. Appl. Nonlinear Anal. < b> 8< /b> (2001), 27–36]. Using this theorem we have the
advantage that the obtained two solutions have their values at
three points of their domain upper and lower bounded by a-priori
given constants.}, number={1}, journal={Topological Methods in Nonlinear Analysis}, author={Tsamatos, Panagiotis Ch.}, year={2006}, month={Sep.}, pages={117–131} }