1. Tsuboi, T. Oscillation, Gendaikogakusha
2. Sawaraghi, G. Nonlinear oscillation Kyoritu Shuppan
3. Oscillation of circular cylinder under the wave by vortex wake;Sawaraghi;Coastal Eng. Japan,1976
4. The motion of spherical buoy under the surface wave;Homma,1973
5. Theoretical analysis on the transverse motion of a buoy under the surface wave;Ogihara;Coastal Eng. Japan,1977