Collins SL, Weich Selbaum RR, Doughely M, Vokes EE, Stupp R. In Martin DA, Armitage JO, Lichter AS, Niederhuber JE eds. Head and neck: clinical oncology. Churchill Livingstone: NY, 1995: 969–969.
5.
Koshy RC, Rhodes D, Devi S, Grossman SA.Cancer pain management in developing countries: a mosaic of complex issues resulting in inadequate analgesia. Supportive Care Cancer1998; 6: 430–437.
6.
El-Shazly MA.Endoscopic surgery of the vidian nerve, preliminary report. Ann Otol, Rhinol1991; 100: 536–536.
7.
Prithviraj P, Richard LR, Gobar BR.Autonomic nerve blocks. In Prithviraj P ed. Pain medicine: a comprehensive review. Mosby Publishers, 1996.