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[7] Serre J.-P.: Algébre Locale Multiplicités. Lecture Notes Mathematics 11, 1975. Zbl 0296.13018
[8] Horák M., Kolář I.: On the higher order Cartan-Poincaré forms. to appear.
[9] Krupka D.: Lepagean forms of the calculus of variations and the structure of the Euler-Lagrange mapping. to appear.
[10] Chrastina J.: A double complex related with a system of partial differential equations I. Zbl 0539.58001
[11] Chгastina J.: An other approach to the classical calculus of variations. I. Lagrange problem. to appear.
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