@article{4393,
  author = {Arthur Phelps},
  title = {The diffusion of charged particles in collisional plasmas: Free and ambipolar diffusion at low and moderate pressures},
  year = {1990},
  journal = {Journal of Research National Institute of Standards and Technology},
  volume = {95},
  pages = {407},
  url = {http://www.archive.org/details/jresv95n4p407},
  note = {JILA Pub. 4231},
}