Geodesic
On a discrete model of an unstationary linear system
Theoretical and applied mechanics, Tome 2 (1976) no. 1, p. 85 .

Voir la notice de l'article provenant de la source eLibrary of Mathematical Institute of the Serbian Academy of Sciences and Arts

The paper considers the motion of a system whose state can be represented by the equations \[ \dot x=A(t)x+B(t)u \] Here it is shown how the approximate method for determining the fundamental matrix can be used to find the matrix $E(t_k)$ and $F(t_k)$ in discrete models \[ x(t_{k+1})=E(t_k)x(t_k)+F(t_k)u(t_k). \] 
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     title = {On a discrete model of an unstationary linear system},
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Dušan J. Mikičić. On a discrete model of an unstationary linear system. Theoretical and applied mechanics, Tome 2 (1976) no. 1, p. 85 . http://geodesic.mathdoc.fr/item/TAM_1976_2_1_a11/