The stellar content of the ring in NGC 660 G. M. Karataeva, N. A. Tikhonov, O. A. Galazutdinova, V. A. Hagen-Thorn and V. A. Yakovleva A&A, 421 3 (2004) 833-837 Published online: 29 June 2004 DOI: 10.1051/0004-6361:20047080