1. Truhar, N., Veselić, K.: An efficient method for estimating the optimal dampers’ viscosity for linear vibrating systems using Lyapunov equation. SIAM J. Matrix Anal. Appl. 31(1), 18–39 (2009)
2. Brabender, K.: Optimale Dämpfung von linearen Schwingungssystemen. PhD thesis, Fernuniversität, Hagen (1998)
3. Nakić, I.: Optimal damping of vibrational systems. PhD thesis, Fernuniversität, Hagen (2002)
4. Truhar, N., Veselić, K.: On some properties of the Lyapunov equation for damped systems. Math. Commun. 9(2), 189–197 (2004)
5. Tisseur, F., Meerbergen, K.: The quadratic eigenvalue problem. SIAM Rev. 43(2), 235–286 (2001)