Wakimoto modules for the affine superalgebra sl(21) and noncritical N = 2 strings

Free field representations of the affine superalgebra A(1, 0)(1) at level k corresponding to two inequivalent choices of the simple roots are shown to be related by nonlinear canonical field transformations, both at the classical and at the quantum level. The ambiguity in the choice of the Wakimoto module needed in the description of physical states in the noncritical N = 2 string is therefore lifted.