The innermost dusty structure in active galactic nuclei as probed by the Keck interferometer M. Kishimoto, S. F. Hönig, R. Antonucci, R. Barvainis, T. Kotani, K. R. W. Tristram, G. Weigelt and K. Levin A&A, 527 (2011) A121 Published online: 08 February 2011 DOI: 10.1051/0004-6361/201016054