Existence and uniqueness of Chern connection in the Klein-Grifone   approach
  The Klein-Grifone approach to global Finsler geometry is adopted. A global existence and uniqueness theorem for Chern connection is formulated and proved. The torsion and curvature tensors of Chern connection are derived. Some properties and the Bianchi identities for this connection are investigated. A concise comparison between Berwald, Cartan and Chern connections is presented. 
Nabil L. Youssef and S. G. Elgendi
math.DG