Harmonic Maps into Homogeneous Spaces According to a Darboux Homogeneous   Derivative
  Our purpose is to use a Darboux homogenous derivative to understand the harmonic maps with values in homogeneous space. We present a characterization of these harmonic maps from the geometry of homogeneous space. Furthermore, our work covers all type of invariant geometry in homogeneous space. 
Alexandre J. Santana and Sim\~ao N. Stelmastchuk
math.DG