1. Caesarean section;Covino,1985
2. Cesarean delivery – Epidural anesthesia;Morrison,1996
3. Regional anaesthetic techniques;Holdcroft,2000
4. Time course of zones of differential sensory blockade during spinal anesthesia with hyperbaric tetracaine or bupivacaine;Brul;Anesth Analg,1989
5. Zones of differential sensory block during extradural anaesthesia;Brul;Br J Anaesth,1991