Eigenvalue comparisons for differential equations on a measure chain.
Eigenvalue computations for regular matrix Sturm-Liouville problems.
Eigenvalue problems of Atkinson, Feller and Krein, and their mutual relationship.
Estimates for Derivatives and Integrals of Eigenfunctions and Associated Functions of Nonself-adjoint Sturm-Liouville Operator With Discontinuous Coefficients (III)
Existence of multiple solutions for a class of second-order ordinary differential equations.
Existence of positive solutions for singular eigenvalue problems.
Existence principles for second order nonresonant boundary value problems.