[1] C. Ehresmann: Les connexions infinitésimales dans un espace fibre différentiable. Coll. Topologie (Bruxelles, 1950), Liège 1951, 29-55. MR 0042768

[2] M. Ferraris M. Francaviglia: The theory of formal connections and fibred connections in fibred manifolds. In: Differential geometry, L. A. Cordero editor, Pittman, 1985, 297-317. MR 0864878

[3] A. Frölicher A. Nijenhuis: Theory of vector valued differential forms. Part I. Derivations in the graded ring of differential forms. Indag. Math. 18 (1956), 338-385. MR 0082554

[4] J. Grifone: Structure presque tangente et connexions, I. Ann. Inst. Fourier, 22, 1 (1972), 287-334. MR 0336636 | Zbl 0219.53032

[5] I. Kolář: Higher order torsion of spaces with Cartan connections. Cahiers de Topologie et Géometrie Differentielle, 12, 2 (1981), 29-34. MR 0315619

[6] I. Kolář: Connections in 2-fibred manifolds. Arch. Math. (Brno), XVII, 1981, 23-30. MR 0672485

[7] P. Libermann: Sur les prolongements des fibrés principaux et grupoides différentiables. Sem. Anal. Glob, Montreal, 1969, 7-108. MR 0356117

[8] P. Libermann: Parallelismes. J. Diff. Geom., 8 (1973), 511 - 539. MR 0353189 | Zbl 0284.53023

[9] L. Mangiarotti M. Modugno: New operators on jet spaces. Ann. Fac. Scie. Toulouse, 5 (1983), 171-198. MR 0735661

[10] L. Mangiarotti M. Modugno: Fibered spaces, jet spaces and connections for field theories. Proceedings of International Meeting "Geometry and Physics", Florence, 1982, Pitagora Editrice, Bologna, 1983, 135-165. MR 0760841

[11] L. Mangiarotti M. Modugno: Graded Lie algebras and connections on a fibred space. J. Math. Pur. et Appl. 63 (1984), 111- 120. MR 0776913

[12] M. Modugno: An introduction to systems of connections. Seminario Instituto di Matematica Applicata "G. Sansone", 1986, 1 - 63.

[13] K. Yano S. Ishihara: Tangent and cotangent bundles. M. Dekker, New York, 1973. MR 0350650

[14] C. Gunther: The polysymplectic Hamiltonian formalism in field theory and calculus of variations. preprint, 1986, 1-57. MR 1023179