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We extend the Berkovits-Maldacena prescription for MHV amplitudes of the opensuperstring to the closed superstring, showing that in the \alpha'=0 limit itreduces to the result of supergravity found recently by Hodges. We also verifythat this prescription calculates the correct superstring tree level MHVamplitude for 4 gravitons including \alpha' corrections.

A simpler prescription for MHV graviton tree amplitudes in superstring theory