A survey for OB associations in the Sculptor Group spiral galaxy NGC 7793 G. Pietrzyński, K. Ulaczyk, W. Gieren, F. Bresolin and R. P. Kudritzki A&A, 440 2 (2005) 783-789 Published online: 01 September 2005 DOI: 10.1051/0004-6361:20042012