Modification of Slow Cortical Potentials in Patients with Refractory Epilepsy: A Controlled Outcome Study. - Kotchoubey, B.; Strehl, U.; Uhlmann, C.; Holzapfel, S.; König, M.; Fröscher, W.; Blankenhorn, V.; Birbaumer, N. (Epilepsia (Series 4), 2001)