1. Brown G. V. and North C. M. (1987). “The impact damped harmonic oscillator in free decay.” NASA Tech. Memo. 89897 Nat. Aeronautics and Space Admin. Washington D.C.
2. Impact damping the second mode of a cantilevered beam
3. Edwins D. J. (1986). Modal testing: theory and practice . Research Studies Press Ltd. Letchworth England.
4. Halpin D. B. (1994). Modal special studies packet—preliminary tests of the impact damper test article . Vibration and Acoustic Test Fac. NASA Johnson Space Ctr. Houston Tex.
5. Masri S. F. (1970). “General motion of impact dampers.” J. Acoustical Soc. of Am. 47(Part 2) 229–237.