Spinor Cartan moving n-hedron, Lorentz-harmonic formulations of superstrings, and κ symmetry
Bandos I. A., Zheltukhin A. A.
Twistor-like formulations of D — 10, N = 2Д and = 4, iV = 1 superstrings are constructed through a harmonic generalization of the Newman-Penrose dyad formalism. The problem of constructing covariant irreducible generators of к symmetry is automatically resolved in these formulations.