1[1]Spencers Lin,Paul Wale,Sundar Rajendran. Effects of concentration and Volume of 2 - chloproprocaine on Epidural Anesthesia in Volunteers.Anesthesiology, 1997,June 86(6): 1288 ~ 1293.
2[2]Kunitoka Y, Sakaguchi H,Yano T, et al. Low concentration/high volume is mere effective than high concentration/low volume for postoperative continuous epidural analgesia with the combination of bupivacain and fentanyle. Masui, 2001 ,Jan 50( 1 ): 20 ~ 25.