“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 27, no. 4 (September 8, 2019): 230–235. Accessed April 19, 2025. https://journalofbabylon.com/index.php/JUBPAS/article/view/2473.