Ryter, F., Angioni, C., Peeters, A. G., Leuterer, F., Fahrbach, H.-U., Suttrop, W., et al. (2005). Experimental Study of Trapped-Electron-Mode Properties in Tokamaks: Threshold and Stabilization by Collisions. Physical Review Letters, 95: 085001. doi:10.1103/PhysRevLett.95.085001.