1. On compact, Riemannian manifolds with constant curvature. I;Calabi,1961
2. Lie Pseudogroups and Mechanics;Pommaret,1988
3. Variations on the de Rham complex;Eastwood;Notices Amer. Math. Soc.,1999
4. On Saint Venant’s compatibility conditions and Poincaré’s lemma;Amrouche;C. R. Math.,2006
5. Déformations localement triviales des variétés riemanniennes;Bergery,1975