The Effectiveness of Spinal Anaesthesia Using 0,5% Hyperbaric Bupivacaine 7,5 mg Plus 25 mcg Fentanyl Compared with 0,5% Hyperbaric Bupivacaine 12,5 mg in Caesarean Section - Bintartho, Agung (The Indonesian Journal of Anesthesiology and Critical Care, 2011)