A photometric study of the W UMa-type system U Pegasi G. Djurašević, H. Rovithis-Livaniou, P. Rovithis, S. Erkapić and N. Milovanović A&A, 367 3 (2001) 840-847 Published online: 15 March 2001 DOI: 10.1051/0004-6361:20000493