Gyrokinetic study of impurity mode in reversed-field pinchS. F. Liu, C. L. Zhang, W. Kong, S. C. Guo, J. Q. Dong, L. M. Liu, Q. Liu and Z. Y. LiuEPL, 97 5 (2012) 55004DOI: https://doi.org/10.1209/0295-5075/97/55004