T. Noma, S. Matsumoto, M. Shimodozono, S. Etoh, and K. Kawahira, “Anti-spastic effects of the direct application of vibratory stimuli to the spastic muscles of hemiplegic limbs in post-stroke patients: A proof-of-principle study”, JRM, vol. 44, no. 4, pp. 325–330, Feb. 2012.