The brightness of electron beams. Worster, J. Journal of Physics D: Applied Physics, 2(3):457--462, March, 1969.
The brightness of electron beams [link]Paper  doi  bibtex   
@article{ worster_brightness_1969,
  title = {The brightness of electron beams},
  volume = {2},
  issn = {00223727},
  url = {http://stacks.iop.org/0022-3727/2/i=3/a=321?key=crossref.34c14ed15861362f7b78a62d3ea4a000},
  doi = {10.1088/0022-3727/2/3/321},
  number = {3},
  urldate = {2014-11-11TZ},
  journal = {Journal of Physics D: Applied Physics},
  author = {Worster, J},
  month = {March},
  year = {1969},
  pages = {457--462}
}

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