  Sigma models on semi-symmetric spaces provide the central building block for
string theories on AdS backgrounds. Under certain conditions on the global
supersymmetry group they can be made one-loop conformal by adding an
appropriate fermionic Wess-Zumino term. We determine the full one-loop dilation
operator of the theory. It involves an interesting new XXZ-like interaction
term. Eigenvalues of our dilation operator, i.e. the one-loop anomalous
dimensions, are computed for a few examples.
