Generalized Action Principle and Geometric Approach for superstrings and   super-p-branes
  In this short printed version of my talk I consider the generalized action for super-p-branes proposed previously in collaboration with D. Sorokin and Dmitrij V. Volkov. I describe briefly, the derivation doubly supersymmetric geometric approach from the generalized action and discuss one of the direction of its possible application. 
Igor A. Bandos