Multiwavelength interferometric observations and modeling of circumstellar disks A. A. Schegerer, T. Ratzka, P. A. Schuller, S. Wolf, L. Mosoni and Ch. Leinert A&A, 555 (2013) A103 Published online: 08 July 2013 DOI: 10.1051/0004-6361/201220190