Evolution of optically faint AGN from COMBO-17 and GEMS by Wisotzki, L, Jahnke, K, Sanchez, S, Wolf, C, Barden, M, Bell, E, Borch, A, HaeUssler, B, Meisenheimer, K, Rix, H, Beckwith, S, Caldwell, J, Jogee, S, Somerville, R, McIntosh, D, Peng, C