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For the \kappa-symmetry gauge fixed superstring action in AdS_5 x S^5 weconsider the fermionic fluctuations over a circular bosonic string backgroundwith two angular momenta and two winding numbers in S^5. The SU(2)-typeredefinitions of fermionic fields and the first-string limit generate atruncated fermionic action for the SU(1|2) sector. It is expressed in atwo-dimensional Lorentz-invariant form of a massive Dirac fermion and theplane-wave spectrum for the fermionic excitations is derived. The fermionicspectrum for the SU(2|2) sector is also analyzed.Comment: 17 pages, LaTeX, no figure

The SU(1|2) and SU(2|2) sectors from superstrings inAdS5×S5

The SU(1|2) and SU(2|2) sectors from superstrings inAdS₅×S⁵