Differential Equations & Applications · Volume 6, Issue 2 Nontrivial solutions for systems of Sturm-Liouville boundary value problems 06-12 Pages 255-265 DOI 10.7153/dea-06-12 Downloads Short PDF Full PDF PNG Authors John R. Graef Shapour Heidarkhani Lingju Kong Keywords nontrivial solutions Sturm-Liouville boundary conditions critical point theory Subject classes 34B15 47J10