Geodesic
On an indirect representation of evolutionary equations in the form of Birkhoff's equations
Eurasian mathematical journal, Tome 13 (2022) no. 3, pp. 23-32.

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In the paper, the problem of an indirect representation of an evolutionary operator equation with the first order time derivative in the form of an operator Birkhoff's equation is solved and the corresponding Pfaffian action is constructed. 
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S. A. Budochkina; H. P. Vu. On an indirect representation of evolutionary equations in the form of Birkhoff's equations. Eurasian mathematical journal, Tome 13 (2022) no. 3, pp. 23-32. http://geodesic.mathdoc.fr/item/EMJ_2022_13_3_a1/

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