Kostić, Aleksandra, and Heinrich Voss. “Real Eigenvalues of Viscoelastic Oscillators Involving Several Damping Models”. Sarajevo Journal of Mathematics 14, no. 1 (August 18, 2018): 35–43. Accessed January 26, 2026. https://www.sjm.anubih.ba/index.php/sjm/article/view/83.