1. Cervical sympathetic and stellate ganglion blocks;Elias;Pain Physician,2000
2. Ganglion cervicale superius: eine anatomische Besonderheit
3. Clara M . Pars cervicalis systematis sympathici. In: Clara M , ed. Das Nervensystem des Menschen, 3rd edition. Barth: Leipzig; 1959:227–233.
4. Lanz T Wachsmuth W . Sympathisches nervensystem. In: Lang J , ed. Lanz Wachsmuth, Praktische Anatomie, Hals, Special Edition. Berlin, Göttingen, Heidelberg: Springer; 2004 (to the 1st Edition of 1955):55–59.
5. New Approaches to Ganglion Impar Blocks via Coccygeal Joints