1. [1] R. A. Adams, Sobolev spaces, Academic Press [A subsidiary of Harcourt Brace Jovanovich, Publishers], New York-London, 1975.
2. [2] I. Ekeland and R. Temam, Analyse convexe et problèmes variationnels, Dunod, 1974, English translation, North-Holland, Amsterdam, 1975.
3. [3] H. Grad, P. N. Hu, and D. C. Stevens, Adiabatic evolution of plasma equilibrium, Proc. Nat. Aacd. Sci. 72 (1975), 3789–3793.
4. [4] H. Grad, Magnetic confinement fusion energy research, Mathematical aspects of production and distribution of energy (Proc. Sympos., San Antonio, Tex., 1976), Proc. Sympos. Appl. Math., XXI, Amer. Math. Soc., Providence, R.I., 1977, pp. 3–40.
5. [5] H. Gourgeon and J. Mossino, Sur un problème à frontière libre de la physique des plasmas, Ann. Inst. Fourier (Grenoble) 29 (1979), no. 4, ix, 127–141.