@article{ziebell_tozawa_1998,  title={The threshold condition for stochastic diffusion of energetic ions due to lower hybrid waves},  volume={28},  ISSN={0103-9733},  url={https://doi.org/10.1590/S0103-97331998000300007},  DOI={10.1590/S0103-97331998000300007},  number={3},  journal={Brazilian Journal of Physics},  publisher={Sociedade Brasileira de Física},  author={Ziebell, L. F. and Tozawa, L. M.},  year={1998},  month={Sep},  pages={222–229} }