Selective cervical nerve root blockade: experience with a safe and reliable technique using an anterolateral approach for needle placement

http://www.ajnr.org/content/ajnr/28/10/1909.full.pdf

Cervical foraminal selective nerve root block: a 'two-needle technique' with results

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2295277/pdf/586_2008_Article_600.pdf

Selective cervical nerve root blockade: prospective study of immediate and longer term complications

http://www.ajnr.org/cgi/reprint/30/3/507

Deep cervical plexus block for the treatment of cervicogenic headache

http://www.painphysicianjournal.com/2008/december/2008;11;849-854.pdf

Cervical radiculopathy: nonoperative management of neck pain and radicular symptoms

http://www.aafp.org/afp/2010/0101/p33.html

Pulsed radiofrequency treatment in interventional pain management: mechanisms and potential indications-a review.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3059755/pdf/701_2010_Article_881.pdf