Geometry of Fermionic Constraints in Superstring Theories
  Considered are superparticle and superstring models invariant under supersymmetry in a target superspace and local extended worldsheet supersymmetry the latter replacing the fermionic $\kappa$--symmetry of the conventional Green--Schwarz formulations. (Talk given at the Conference on Geometry of Constrained Dynamical Systems,   Cambridge, June 15-18, 1994). 
Dmitrij Sorokin