Summation of diagrams in N=1 supersymmetric electrodynamics, regularized   by higher derivatives
  For the massless N=1supersymmetric electrodynamics, regularized by higher derivatives, the Feynman diagrams, which define the divergent part of the two-point Green function and can not be found from Schwinger-Dyson equations and Ward identities, are partially summed. The result can be written as a special identity for Green functions. 
K.Stepanyantz