Preoperative activation and intraoperative stimulation of language-related areas in patients with glioma. - Herholz,K.; Reulen,H.J.; von Stockhausen,H.M.; Thiel,A.; Ilmberger,J.; Kessler,J.; Eisner,W.; Yousry,T.A.; Heiss,W-D. (Neurosurgery, 1997)