1. Alfv�n, H. and Carlquist, P.: 1967,Solar Phys. 1, 220.
2. Babi?, M. and Torv�n, S.: 1972, inSecond Int. Conf. on Gas Discharges IEE, London.
3. Berk, H. L. and Roberts, K. V.: 1967,Phys. Fluids 10, 1595.
4. Bernstein, I. B., Greene, J. M. and Kruskal, M. D.: 1957,Phys. Rev. 108, 564.
5. Block, L. P.: 1972,Cosmic Electrodyn. 3, 349.