Bounds on Real and Imaginary Parts of Non-Real Eigenvalues of a Non-Definite Sturm-Liouville Differential Equation with Cauchy Boundary Conditions. (2019). JOURNAL OF UNIVERSITY OF BABYLON for Pure and Applied Sciences, 27(4), 230-235. https://journalofbabylon.com/index.php/JUBPAS/article/view/2473