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The fermionic NSR string possesses a hidden N = 2 superconformal algebra onthe world-sheet. In this work, we show how to use an isomorphism of thisalgebra, the so-called spectral flow, for construction of a subspace ofphysical states of the string, on which space-time supersymmetry acts. Thisconstruction is an alternative to the GSO-projection in string theory.

N = 2 superconformal algebra in NSR string and Gepner approach to space-time supersymmetry in ten dimensions