1. H. N.Abramson - H. J.Plass - E. A.Ripperge,Stress wave propagation in rods and beams, Advances Appl. Mech.,5, Academic Press (1958), pp. 111–194.
2. R.Aprahamian - D. A.Evensen, J. Appl. Mech.-Trans. ASME (June 1970), pp. 287–291.
3. A. Arosio,Linear second order differential equations in Hilbert space. The Cauchy problem and asymptotic behaviour for large time, Arch. Rat. Mech. Anal., 86, No. 2 (1984), pp. 147–180.
4. A. Arosio,Equations différentielles opérationnelles linéaires du deuxieme ordre: problème de Cauchy et comportement asymptotique lorsque t→+∞, C.R. Acad. Sci. Paris, Sér. I,295 (1982), pp. 83–86.
5. A.Arosio - S.Panizzi - M. G.Paoli,Inhomogeneous Timoshenko beam equations, short communication at 5th Symposium on «Control of distributed parameter systems» (Perpignan, June '89).