1. Alfinito E., Profilo G., Soliani G., Properties of equations of the continuous Toda type, J. Phys. A, 1997, 30(5), 1527–1547
2. Błaszak M., Classical R-matrices on Poisson algebras and related dispersionless systems, Phys. Lett. A, 2002, 297(3–4), 191–195
3. Bryant R.L., Griffiths Ph.A., Characteristic cohomology of differential systems II: Conservation laws for a class of parabolic equations, Duke Math. J., 1995, 78(3), 531–676
4. Cartan É., Sur la structure des groupes infinis de transformations, In: Œuvres complétes, 2(2), Gauthier-Villars, Paris, 1953, 571–714
5. Cartan É., Les sous-groupes des groupes continus de transformations, In: Œuvres Complètes, 2(2), Gauthier-Villars, Paris, 1953, 719–856