1. Amster LJ. Sphenopalatine ganglion block for the relief of painful vascular and muscular spasm with special reference to lumbosacral pain. N Y State J Med. 1948;48:2475–80.
2. Auberger HG. Niesel HC. Gesichtsschädel: Proximale Leitungsanästhesie im Bereich des N. trigeminus. In: Auberger HG, Niesel HC, Hrsg. Praktische Lokalanästhesie. 4 Auflage. Stuttgart/New York: Georg Thieme Verlag; 1982.
3. Berger JJ, Pyles ST, Saga-Rumley SA. Does topical anesthesia of the sphenopalatine ganglion with cocaine or lidocaine relieve low back pain? Anesth Analg. 1986;65:700–2.
4. Bonica JJ. Block of cranial nerves. In: Bonica JJ, editor. The management of pain. 2nd ed. Philadelphia: Lea & Febiger; 1990.
5. Byrd H, Byrd W. Sphenopalatine phenomena: present status of knowledge. Arch Intern Med. 1930;46:1026–38.