Long-term photometric behaviour of the RS CVn binary RT Lacertae Ö. Çakırlı, C. İbanoǧlu, G. Djurašević, S. Erkapić, S. Evren and G. Taş A&A, 405 2 (2003) 733-745 Published online: 19 June 2003 DOI: 10.1051/0004-6361:20030650