1. 4) Hirotani, N., Ishimaru, S. and HATA, I. : A Building Mass Damper (A Creatively Tuned Mass Damper Utilizing Dynamic Mass), 13th World Conference on Seismic Isolation (13th WCSI), 2013.9
2. 5) J.P.Den Hartog : Mechanical Vibration, 4th ed., McGraw-Hill, pp. 87-106, 1956