Bhole, A., Nkonga, B., Pamela, S., Huijsmans, G., Hoelzl, M., & JOREK Team (2022). Treatment of polar grid singularities in the bi-cubic Hermite-Bézier approximations: Isoparametric finite element framework. Journal of Computational Physics, 471: 111611. doi:10.1016/j.jcp.2022.111611.