Observation of electrostatic fluctuations driven by runaway electrons in EAST disruptions oleh T. Tang, L. Zeng, Z.Y. Qiu, S.Y. Lin, Y.W. Sun, G.Y. Wei, X. Zhu, D.L. Chen, Y. Huang, Y.M. Duan, L.Q. Xu, H.D. Zhuang, H.Q. Liu, J.P Qian, C.X. Luo, A. Ti, H.L. Zhao, Y.X. Jie, Y.F. Liang, X. Gao