1. Spinal anesthesia for caesarean operation;Braga A;employment association hyperbaric bupivacaine (10 mg) different adjuvants. Rev Bras Anestesiol,2012
2. Clonidine binds to imidazole binding sites as well as alpha 2 - adrenoceptors in the ventrolateral medulla;Ernsberger P;Eur J Pharmacol,1987
3. Catecholamines, sympathomimetic drugs, and adrenergic receptor antagonists. The pharmacological basis of therapeutics;Hoffman B,1996
4. Clonidine: from nasal decongestant analgesic the powerful;Simonetti MPB;pharmacological and historical considerations. Rev Bras Anestesiol,1997
5. Usefulness of lateral internal sphincterotomy combined with hemorrhoidectomy by the Milligan - Morgan's technique: results of a prospective randomized trial;Amorotti C;Chir Ital,2003