Holomorphic extension of smooth CR-mappings between real-analytic and   real-algebraic CR-manifolds
  We establish results on holomorphic extension of CR-mappings of class $C^\infty$ between a real-analytic CR-submanifold of $\C^N$ and a real-algebraic CR-submanifold of $\C^{N'}$. 
F. Meylan, N. Mir, and D. Zaitsev