@inbook{55798004, author={Rajesh Pahwa and Kelly E. Lyons}, editor={Watts, Ray L. and Standaert, David G. and Obeso, Jose A.}, title={Chapter 25. Essential Tremor}, booktitle={Movement Disorders, 3e}, publisher={The McGraw-Hill Companies}, address={New York, NY}, year={2012}, url={neurology.mhmedical.com/content.aspx?aid=55798004} }