1. [1] I. M. Anderson, The Variational Bicomplex, forthcoming.
2. [2] I. M. Anderson and T. Duchamp, On the existence of global variational principles, Amer. J. Math. 102 (1980), no. 5, 781–868.
3. [3] I. M. Anderson and M. Fels, Variational operators for ordinary differential equations, Hamiltonian operators, and the method of equivalence, in preparation.
4. [4] I. M. Anderson and M. Juráš, Generalized Laplace invariants and the method of Darboux, to appear in Duke Math. J.
5. [5] I. M. Anderson and N. Kamran, The variational bicomplex for second-order scalar partial differential equations in the plane, Department of Mathematics, Utah State University, Septembre 1994.