@article{7712,
  author = {Sydney Geltman},
  title = {Threshold behaviour for ionisation by electrons and positrons},
  year = {1983},
  journal = {Journal of Physics B: Atomic and Molecular Physics},
  volume = {16},
  pages = {L525 - L528},
  month = {Feb-09-1984},
  issn = {0022-3700},
  doi = {10.1088/0022-3700/16/17/004},
}