1. Conkwright, N. B. 1934. Differential Equations. Macmillian: New York, pp. 19–25
2. Resonant particle instabilities in a uniform magnetic field
3. Nonconvective and convective electron cyclotron harmonic instabilities
4. Nicholson, D. R. Introduction to Plasma Theory. Krieger Publishing: Malabar, FL, 1983, Chapter 6
5. Stix, T. H. Waves in Plasmas. American Institute of Physics: New York, 1992, Chapters 10 and 11