1. H. W. Drawin and F. Emard
Instantaneous population densities of the excited levels of hydrogen atoms and hydrogen-like ions in plasmas
Physica B+C Volume 85, Issue 2, December 1976, Pages 333-356
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http://dx.doi.org/10.1016/0378-4363(76)90031-0Ground-state populations of atomic hydrogen and hydrogen-like ions in nonthermal plasmas, and collisional-radiative recombination and ionization coefficients
Physica B+C Volume 94, Issue 1, April 1978, Pages 134-140
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http://dx.doi.org/10.1016/0378-4363(78)90085-2