Hongying Feng, Wenlu Zhang, Zhihong Lin, Xiaohe Zhufu, Jin Xu, Jintao Cao and Ding Li. (2018). Development of Finite Element Field Solver in Gyrokinetic Toroidal Code.
            <i>Communications in Computational Physics</i>. <i>24</i> (3).
            655-671.
         doi:10.4208/cicp.OA-2017-0139