1. Frahm, H., 1911, Device for Damping Vibrations of Bodies, U.S. Patent, No. 989, 958, pp. 3576–3580.
2. The theory of the dynamic vibration absorber;Ormondroyd;ASME J. Appl. Mech.,1928
3. The damping of the foundation vibrations at varying excitation frequency;Hahnkamm;Ing. Arch.,1932
4. A note on the damped vibration absorber;Brock;ASME J. Appl. Mech.,1946
5. Mechanical Vibrations;Den Hartog,1956