1. “Some Differential Geometric Aspects of the Lagrange Variational Problem”;Hermann;Illinois J. Math.,1962
2. “Cartan Connections and the Equivalence Problems for Geometric Structures”;Hermann;Contributions to Differential Equations,1964
3. “E. Cartan's Geometric Theory of Partial Differential Equations”;Hermann;Advances in Math.,1965
4. “The Second Variation for Variational Problems in Canonical Form”;Hermann;Bull. Am. Math. Soc.,1965
5. “The Second Variation for Minimal Submanifolds”;Hermann;J. Math. and Mech.,1966