PAH chemistry and IR emission from circumstellar disks R. Visser, V. C. Geers, C. P. Dullemond, J.-C. Augereau, K. M. Pontoppidan and E. F. van Dishoeck A&A, 466 1 (2007) 229-241 Published online: 29 January 2007 DOI: 10.1051/0004-6361:20066829