@inbook{3420177, author={Dwight Ligham and Lloyd Saberski}, editor={Warfield, Carol A. and Bajwa, Zahid H.}, title={Chapter 66. Spinal Canal Endoscopy}, booktitle={Principles & Practice of Pain Medicine, 2e}, publisher={The McGraw-Hill Companies}, address={New York, NY}, year={2004}, url={accessanesthesiology.mhmedical.com/content.aspx?aid=3420177} }