1. Physiological tremor, pathological tremor, and gradation of muscle force;Desmedt,1979
2. Clinical Voice Disorders;Aronson,1985
3. Psychology of Music;Seashore,1967
4. Acoustical cues in the voice for detecting laryngeal diseases and individual behaviour;Winckel,1974
5. Characteristics of vocal tremor in spastic dysphonia: a preliminary study;Izdebski,1979