Hamilton-Jacobi theory and moving frames. MacArthur, Joshua D., McLenaghan, Raymond G., Smirnov, Roman G. (2007) SIGMA. Symmetry, Integrability and Geometry: Methods and Applications [electronic only]
Hidden symmetries of integrable systems in Yang-Mills theory and Kähler geometry Kanehisa Takasaki (1990/1991) Séminaire Équations aux dérivées partielles (Polytechnique)
Hierarchy of integrable geodesic flows. Peter Topalov (2000) Publicacions Matemàtiques A family of integrable geodesic flows is obtained. Any such a family corresponds to a pair of geodesically equivalent metrics.