[1] C. Godbillon: Géométrie différentielle et méchanique analytique. Paris 1969. MR 0242081 | Zbl 0174.24602

[2] /. Janyska: Geometrical properties of prolongation functors. Čas. pro pěst. mat. 110 (1985), 77-86. MR 0791280 | Zbl 0582.58002

[3] G. Kainz P. Michor: Natural transformations in differential geometry. to appear in Czech. Math. J. MR 0913992

[4] I. Kolář: On the second tangent bundle and generalized Lie derivatives. Tensor, N.S., 38 (1982), 98-102. MR 0832633

[5] I. Kolář: Natural transformations of the second tangent functor into itself. Arch. Math. (Brno), XX(1984), 169-172. MR 0784868

[6] I. Kolář Z. Radziszewski: Some $GL(n,R)$-equivariant smooth maps. Seminar report, Brno 1986.

[7] M. Modugno G. Stefani: Some results on second tangent and cotangent spaces. Quaderni dell'Istituto di Matematica dell' Università di Lecce, Q. 16, 1978.

[8] A. Nijenhuis: Natural bundles and their general properties. Differential Geometry, in honour of K. Yano, Kinokuniya, Tokyo, 1972, 317-334. MR 0380862 | Zbl 0246.53018

[9] R. S. Palais С. L. Terng: Natural bundles have finite order. Topology 16 (1977), 271 - 277. DOI 10.1016/0040-9383(77)90008-8 | MR 0467787