Rosseland and Planck mean opacities for protoplanetary discs D. Semenov, Th. Henning, Ch. Helling, M. Ilgner and E. Sedlmayr A&A, 410 2 (2003) 611-621 Published online: 17 November 2003 DOI: 10.1051/0004-6361:20031279