1. T. H. Stix,The Theory of Plasma Waves(McGraw-Hill, New York, 1962), Chap. 7.
2. R. Z. Sagdeev and A. A. Galeev,Nonlinear Plasma Theory, edited by T. M. O’Neil and D. L. Book (Benjamin, New York, 1969), Chap. II.
3. Stabilization of ion acoustic waves by electron trapping