Dust sedimentation in protoplanetary disks with polycyclic aromatic hydrocarbons C. P. Dullemond, Th. Henning, R. Visser, V. C. Geers, E. F. van Dishoeck and K. M. Pontoppidan A&A, 473 2 (2007) 457-466 Published online: 06 August 2007 DOI: 10.1051/0004-6361:20077581