O'Neil, T. M.; Malmberg, J. H. (1 August 1968). "Transition of the Dispersion Roots from Beam-Type to Landau-Type Solutions". The Physics of Fluids. 11 (8): 1754–1760. Bibcode:1968PhFl...11.1754O. doi:10.1063/1.1692190.
Drummond, W. E.; et al. (1 September 1970). "Nonlinear Development of Beam-Plasma instability". The Physics of Fluids. 13 (9): 2422–2425. Bibcode:1970PhFl...13.2422D. doi:10.1063/1.1693255.
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O'Neil, T. M.; Malmberg, J. H. (1 August 1968). "Transition of the Dispersion Roots from Beam-Type to Landau-Type Solutions". The Physics of Fluids. 11 (8): 1754–1760. Bibcode:1968PhFl...11.1754O. doi:10.1063/1.1692190.
Drummond, W. E.; et al. (1 September 1970). "Nonlinear Development of Beam-Plasma instability". The Physics of Fluids. 13 (9): 2422–2425. Bibcode:1970PhFl...13.2422D. doi:10.1063/1.1693255.
