Liu E, Wong H, Lim H, Chia H, Chen Z, Lee T. Effects of isoflurane and propofol on cortical somatosensory evoked potentials during comparable depth of anesthesia as guided by bispectral index. Br J Anaesth 2005; 94: 193-7.
Clapcich J, Emerson G, Roye P, Hui X, Edward J, Dowling C, et al. The effects of propofol, smoll-dose isoflurane, and nitrous oxide on cortical somatosensory evoked potential and bispectral index monitoring in adolescents undergoing spinal fusion. Anesth Analg 2004; 99: 1334-40.