Spitzer IRS spectroscopy of 3CR radio galaxies and quasars: testing the unified schemes M. Haas, R. Siebenmorgen, B. Schulz, E. Krügel and R. Chini A&A, 442 3 (2005) L39-L43 Published online: 14 October 2005 DOI: 10.1051/0004-6361:200500185