Weak lensing observations of potentially X-ray underluminous galaxy clusters J. P. Dietrich, A. Biviano, P. Popesso, Y.-Y. Zhang, M. Lombardi and H. Böhringer A&A, 499 3 (2009) 669-677 Published online: 16 April 2009 DOI: 10.1051/0004-6361/200811433