1) Yu. N. Petrenko and A. P. Popryadukhin: Proc. 3rd International Symposium on Toroidal Plasma Confinement, Garching, 1973 (Max-Planck-Institute for Plasma Physics, Garching, 1973) Paper D8.
2) H. Wobig and S. Rehker: Proc. 7th Symposium on Fusion Technology, Grenoble, 1972 (The Commission of the European Communities, Luxembourg, 1972) p. 345.
4) A. I. Morozov and L. S. Solov’ev: Reviews of Plasma Physics (Consultants Bureau, New York, 1966) Vol. 2, p. 1.