Jianguo Xin, Nailong Guo, & Wei Cai. (1970). On the Construction of Well-Conditioned Hierarchical Bases for Tetrahedral $\mathcal{H}{(curl)}$-Conforming Nédélec Elements. Journal of Computational Mathematics. 29 (5). 526-542. doi:10.4208/jcm.1103-m3464