Geodesic
An Analog of the Cameron–Johnson Theorem for Linear $\mathbb C$-Analytic Equations in Hilbert Space
Matematičeskie zametki, Tome 68 (2000) no. 6, pp. 935-938 
D. N. Cheban. An Analog of the Cameron–Johnson Theorem for Linear $\mathbb C$-Analytic Equations in Hilbert Space. Matematičeskie zametki, Tome 68 (2000) no. 6, pp. 935-938. http://geodesic.mathdoc.fr/item/MZM_2000_68_6_a13/
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     title = {An {Analog} of the {Cameron{\textendash}Johnson} {Theorem} for {Linear} $\mathbb C${-Analytic} {Equations} in {Hilbert} {Space}},
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Voir la notice de l'article provenant de la source Math-Net.Ru

The well-known Cameron–Johnson theorem asserts that the equation $\dot x=\mathcal A(t)x$ with a recurrent (Bohr almost periodic) matrix $\mathcal A(t)$ can be reduced by a Lyapunov transformation to the equation $\dot y=\mathcal B(t)y$ with a skew-symmetric matrix $\mathcal B(t)$, provided that all solutions of the equation $\dot x=\mathcal A(t)x$ and of all its limit equations are bounded on the whole line. In the note, a generalization of this result to linear $\mathbb C$-analytic equations in a Hilbert space is presented.

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