Supersymmetry, supergravity, and related topics : proceedings of the XVth GIFT International Seminar on Theoretical Physics, 4-9 June 1984, Sant Feliu de Guíxols, Girona, Spain / - Aguila, F. del.; Azcárraga, J. A. de,; Ibáñez, L. E. (World Scientific,, 1985)