TY - BOOK AU - Wightman, A. S. TI - TROUBLES IN THE EXTERNAL FIELD PROBLEM FOR INVARIANT WAVE EQUATIONS U1 - 539.721 PY - 1971/// CY - N. Y. PB - Gordon And Breach KW - Particles (Nuclear Physics) -- Congs KW - Invariants -- Congresses KW - Equations -- Congs N1 - Lectures From The Coral Gables Conference On Fundamental Interactions At High Energy, January 20-22, 1971 ER -