Energy Principle with Globial Invariants for Toroidal Plasmas Bhattacharjee, A. ; Dewar, R. L. ; Monticello, D. A. Abstract Publication: Physical Review Letters Pub Date: October 1980 DOI: 10.1103/PhysRevLett.45.1217 Bibcode: 1980PhRvL..45.1217B