JWAMER, K. H. F.; QADR, K. H. Bounds on Real and Imaginary Parts of Non-Real Eigenvalues of a Non-Definite Sturm-Liouville Differential Equation with Cauchy Boundary Conditions. JOURNAL OF UNIVERSITY OF BABYLON for Pure and Applied Sciences, v. 27, n. 4, p. 230 - 235, 8 Sep. 2019.