SARCS strong-lensing galaxy groups - I. Optical, weak lensing, and scaling laws G. Foëx, V. Motta, M. Limousin, T. Verdugo, A. More, R. Cabanac, R. Gavazzi and R. P. Muñoz A&A, 559 (2013) A105 Published online: 22 November 2013 DOI: 10.1051/0004-6361/201321112