S. Göksu, H. Koçoğlu, L. Pirbudak, and Ünsal Öner, “The comparison of the intrathecal pethidine with intrathecal bupivacaine in transurethral resection of prostate”, Eur J Ther, vol. 11, no. 1, 2, pp. 11–15, Jan. 2000.