The concentration–mass relation of clusters of galaxies from the OmegaWINGS survey A. Biviano, A. Moretti, A. Paccagnella, B. M. Poggianti, D. Bettoni, M. Gullieuszik, B. Vulcani, G. Fasano, M. D’Onofrio, J. Fritz and A. Cava A&A, 607 (2017) A81 Published online: 17 November 2017 DOI: 10.1051/0004-6361/201731289