1. Wolfgang Lotz
Electron-impact ionization cross-sections and ionization rate coefficients for atoms and ions from hydrogen to calcium
Zeitschrift für Physik A Hadrons and Nuclei
Volume 216, Number 3, 241-247
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http://dx.doi.org/10.1007/BF013929632. Joseph A. Kunc
Electron-impact ionization rates for excited atoms and ions
International Journal or Mass Spectrometry and Ion Physics
Volume 40, Issue 1, September 1981, Pages 43-51
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http://dx.doi.org/10.1016/0020-7381(81)85005-X