1. G. A. Emmert (private communication).
2. New approach to magnetohydrodynamic stability: I. A practical stability concept
3. Nonlinear development of absolute and convective instabilities
4. L. S. Solov’ev inReviews of Plasma Physics, edited by M. A. Leontovich (Plenum, New York, 1967), Vol. 3, p. 301.