Suppression of MHD activity with limiter biasing in the HT-7 tokamak H.W. Lu, J.R. Luo, F.C. Zhong, X.J. Zha, L.Q. Hu and HT-7 Team Eur. Phys. J. D, 66 8 (2012) 213 Published online: 16 August 2012 DOI: 10.1140/epjd/e2012-30283-1