“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): 230-35. https://journalofbabylon.com/index.php/JUBPAS/article/view/2473.