@article{EngelsPeyerimhoff1989,
  author    = {Bernd Engels and S.D. Peyerimhoff},
  title     = {The hyperfine coupling constants of the X\(^3\)Σ\(^-\) state of NH : Influence of polarization functions and configuration space on the description of spin polarization},
  year      = {1989},
}