1. Neuronal mechanisms underlying physiological tremor;Allum, J.H.J.; Dietz, V.; Freund, H.-J.;J Neurophysiol,1978
2. The muscle activity spectrum: spectral analysis of muscle force as an estimator of overall motor unit activity;Homberg, V.; Reiners, K.; Hefter, H.; Freund, H.J.;Electroencephalogr Clin Neurophysiol,1986
3. Participation of the Stretch Reflex in Human Physiological Tremor;Hagbarth, K.E.; Young, R.R.;Brain,1979
4. Beitrag zum Studium des Zitterns;Wertheim-Salonmonson, J.K.A.;Dtsch Z Nervenheilk
5. Kollaritz J. Oiber das Zittern. Dtsch Z Nervenheilk 1910;38:438-79.