@conference{8682,
  author = {Arthur Phelps},
  title = {Excitation and ionization coefficients},
  year = {1987},
  publisher = {Pergamon Press},
  address = {Knoxville, Tennessee},
  isbn = {ISBN-10: 0080346936 ISBN-13: 978-0080346939},
  note = {JILA Pub. 3535},
}