1. The Stellarator Concept
2. Sections J-L form a somewhat revised version of a previous work: M. D. Kruskal, U.S. Atomic Energy Commission Report No. NYO-7307, (PM-S-17), 1955.
3. Except for the two auxiliary conditions, which were new, this was largely a more mathematical version of an earlier theory: L. Spitzer, Jr., U.S. Atomic Energy Commission Report No. NYO-997 (PM-S-4), 1952.
4. P. Alexandroff and H. Hopf,Topologie(Verlag Julius Springer, Berlin, Germany, 1935), p. 552, Satz III.
5. Motion of magnetic lines of force