Tuning anisotropy by impurities: magnetocaloric experiments on CsNi0.9Fe0.1Cl3 J. Wolf, K. Kiefer, M. C. Rheinstädter, K. Knorr and M. Enderle Eur. Phys. J. B, 22 4 (2001) 461-471 Published online: 15 August 2001 DOI: 10.1007/s100510170096