Dust in active nuclei - I. Evidence for "anomalous"properties R. Maiolino, A. Marconi, M. Salvati, G. Risaliti, P. Severgnini, E. Oliva, F. La Franca and L. Vanzi A&A, 365 2 (2001) 28-36 Published online: 15 January 2001 DOI: 10.1051/0004-6361:20000177