1. Superior hypogastric plexus block;Patt,1996
2. Neurolytic blocks of the sympathetic axis;Plancarte,1993
3. Modified approach to block the ganglion Impar (ganglion of Walther);Wemm;Reg Anesth,1995
4. An alternative needle geometry for interruption of ganglion Impar;Nebab;Anesthesiology,1997