Discovery of a strong Baldwin effect in mid-infrared AGN lines S. F. Hönig, A. Smette, T. Beckert, H. Horst, W. Duschl, P. Gandhi, M. Kishimoto and G. Weigelt A&A, 485 2 (2008) L21-L24 Published online: 22 May 2008 DOI: 10.1051/0004-6361:200810123