@article{11447,
  author = {P. Hammerling},
  title = {Note on "The Effective Operator Formalism in Optical Pumping"},
  year = {1968},
  journal = {Acta Physica Austriaca},
  volume = {28},
  chapter = {299},
  pages = {299-302},
  note = {JILA Pub. 351},
}