1. Anderson, I.M.: The variational bicomplex. Utah State Technical Report (1989).
http://math.usu.edu/~fg_mp
2. Arnaldsson, Ö.: Involutive moving frames. Ph.D. thesis, University of Minnesota (2017)
3. Arnaldsson, Ö.: Reduced Cartan Characters for Polynomial Ideals and Termination of Cartan’s Equivalence Method (preprint). University of Iceland, Reykjavík (2017)
4. Benson, J., Valiquette, F.: Symmetry reduction of ordinary finite difference equations using moving frames. J. Phys. A 50, 195201 (2017)
5. Berchenko, I.A., Olver, P.J.: Symmetries of polynomials. J. Symb. Comput. 29, 485–514 (2000)