Finite basis sets for the Dirac equation constructed from B splines.

@article{Johnson1988FiniteBS,
  title={Finite basis sets for the Dirac equation constructed from B splines.},
  author={Johnson and Blundell and Sapirstein},
  journal={Physical review. A, General physics},
  year={1988},
  volume={37 2},
  pages={307-315}
}