J0454-0309: evidence of a strong lensing fossil group falling into a poor galaxy cluster M. Schirmer, S. Suyu, T. Schrabback, H. Hildebrandt, T. Erben and A. Halkola A&A, 514 (2010) A60 Published online: 20 May 2010 DOI: 10.1051/0004-6361/200913810