1. KadomtsevB. B. and PogutseO. P.:Zh. Eksper. Teoret. Fiz. 65 (1973), 2 (in Russian).
2. WhiteR., MonticelloD., RosenbluthM. N., StraussH., and KadomtsevB. B.: Numerical study of nonlinear evolution of kink and tearing modes in tokamaks,International Conference of Plasma Physics, Tokyo, 1974, IAEA Vienna, 1975, Vol. 1, pp. 495?504 3. Strauss, H. R.: Nonlinear three-dimensional magnetohydrodynamics of noncircular tokamaks,Phys. Fluids 19 (1976), 134?140.
3. WhiteR., MonticelloD. and RosenbluthM. N.: Simulation of large magnetic islands: A possible mechanism for major tokamak disruption,Phys. Rev. Lett. 39 (1977), 1618?1620.
4. VinogradovA. M.: Local symmetries and conservation laws,Acta Appl. Math. 2, (1984), 21?78.
5. SamokhinA. V.: Nonlinear MHD-equation: Symmetries, solutions and conservation laws,Dokl. Acad. Nauk SSSR 65 (1985), 1101?1106.