1. By minimum-Bprinciple: (experiment) Yu. B. Gott, M. S. Ioffe, and V. G. Telkovsky, Nucl. Fusion Suppl. Pt. III, 1045 (1962);
2. Some Stable Plasma Equilibria in Combined Mirror-Cusp Fields
3. Observation of Plasma Instability with Rotational Effects in a Mirror Machine
4. (theory) M. N. Rosenbluth, N. A. Krall, and N. Rostoker, Nucl. Fusion Suppl. Pt. 1, 143 (1962).
5. The Stellarator Concept