2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/53904Considered are superparticle and superstring models invariant under supersymmetry in a target superspace and local extended worldsheet supersymmetry the latter replacing the fermionic $κ$--symmetry of the conventional Green--Schwarz formulations. (Talk given at the Conference on Geometry of Constrained Dynamical Systems, Cambridge, June 15-18, 1994).7 pages, preprint KCL-TH-94-9High Energy Physics - Theorytext