@article{10887,
  author = {W. Harter and C. Patterson},
  title = {Theory of hyperfine and superfine levels in symmetric polyatomic molecules. Trigonal and tetrahedral molecules: Elementary spin-1/2 cases in vibronic ground states},
  year = {1979},
  journal = {Physical Review A},
  volume = {19},
  pages = {2277-2303},
  month = {Jan-06-1979},
  issn = {0556-2791},
  url = {http://link.aps.org/doi/10.1103/PhysRevA.19.2277},
  doi = {10.1103/PhysRevA.19.2277},
}