[1] I. Kolař:
Connections in 2-fibered manifolds. Arch. Math. 1, 1981, 23-30.
MR 0672485
[2] I. Kolař:
Some natural operation with connections. to appear.
MR 0994555
[3] I. Kolař:
Some natural operators in differential geometry. Proc. Conf. Diff. Geom. and its Appl. Brno 1986, Dordrеcht 1987, 91-110.
MR 0923346
[4] D. Krupka Ј. Јanyška: Lectures on differential invariants. to appear in UЈEP Brno (Czechoslovakia), 1988.
[5] Ј. Ѕlovak:
On the finite order of some operators. Proc. Conf. Diff. Geom. and its Appl., Brno 1986, Dordrecht 1987, 283-294.
MR 0923390