Prospective comparison, randomised among different doses of 0,5 % hyperbaric bupivacaine in unilateral spinal anesthesia for knee arthroscopy in day-surgery-preliminary data. - Lorenzini,L.; Stagni,F.; Borghi,B.; Brescia,G.; Calò,P.; Bugamelli,S.; Nepoti,M.L.; Agnoletti,V. (IMRAPT, 2000)