1. Belinskiy B. and Lasiecka I., Gevrey’s and trace regularity of a semigroup associated with beam equation and non-monotone boundary conditions.J. Math. Anal. Appl.332(2007) 137–154.
2. N.Dunford and J.T. Schwartz, Linear Operators, Part III. John Wiley & Sons, Inc., New York-London-Sydney (1971).
3. I.C. Gohberg and M.G. Krein, Introduction to the Theory of Linear Nonselfadjoint Operators. Vol. 18 ofTrans. Math. Monogr.AMS Providence, Rhode Island (1969).
4. Guo B.Z., Wang J.M. and Yung S.P., On theC0-semigroup generation and exponential stability resulting from a shear force feedback on a rotating beam.Systems Control Lett.54(2005) 557–574.
5. Krstic M., Control of an unstable reaction-diffusion PDE with long input delay.Systems Control Lett.58(2009) 773–782.