Applications harmoniques et hyperbolicit\'e des domaines tubes
  An application of the Zalcman renormalization theorem to harmonic functions shows that the limit functions are nonconstant affine. Extensions of this method are given for maps with values in a torus or in a complex Lie groups. As an application, we give criteria of Kobayashi hyperbolicity for tubes in ${\Bbb C}^2$. 
J-J. Loeb