1.
Spinal hyperbaric ropivacaine-fentanyl for day-surgery
by Kallio, Helena
Regional anesthesia and pain medicine, 2005, Vol.30 (1), p.48-54

2.
Technical aspects and postoperative sequelae of spinal and epidural anesthesia: A prospective study of 3,230 orthopedic patients
by Puolakka, Risto
Regional anesthesia and pain medicine, 2000-09, Vol.25 (5), p.488-497
