@Article{Kong2018, author = "Kong, Qingkai and St. George, Thomas E.", title = "Linear Sturm-Liouville problems with Riemann-Stieltjes integral boundary conditions", journal = "Opuscula Math.", year = "2018", volume = "38", number = "4", pages = "557--571", doi = "https://doi.org/10.7494/OpMath.2018.38.4.557", url = "https://doi.org/10.7494/OpMath.2018.38.4.557", abstract = "We study second-order linear Sturm-Liouville problems involving general homogeneous linear Riemann-Stieltjes integral boundary conditions. Conditions are obtained for the existence of a sequence of positive eigenvalues with consecutive zero counts of the eigenfunctions. Additionally, we find interlacing relationships between the eigenvalues of such Sturm-Liouville problems and those of Sturm-Liouville problems with certain two-point separated boundary conditions.", keywords = "nodal solutions, integral boundary value problems, Sturm-Liouville problems, eigenvalues, matching method", issn = "1232-9274" }