Ionic characteristics in cardiac alternans suppression using T ± ϵ feedback control Shiuan-Ni Liang, Duy-Manh Le, Pik-Yin Lai and C. K. Chan EPL, 115 4 (2016) 48001 Published online: 20 September 2016 DOI: 10.1209/0295-5075/115/48001