Geodesic
Note on the Y -Boundedness of the Solutions of a System of Differential Equations
Acta mathematica Universitatis Comenianae, Tome 73 (2004) no. 2 
A. Diamandescu. Note on the Y -Boundedness of the Solutions
of a System of Differential Equations. Acta mathematica Universitatis Comenianae, Tome 73 (2004) no. 2. http://geodesic.mathdoc.fr/item/AMUC_2004_73_2_a9/
@article{AMUC_2004_73_2_a9,
     author = {A. Diamandescu},
     title = {Note on the {Y} {-Boundedness} of the {Solutions
of} a {System} of {Differential} {Equations}},
     journal = {Acta mathematica Universitatis Comenianae},
     year = {2004},
     volume = {73},
     number = {2},
     url = {http://geodesic.mathdoc.fr/item/AMUC_2004_73_2_a9/}
}
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Voir la notice de l'article provenant de la source Comenius University

It is proved a necessary and sufficient condition for the existence of $\Psi$-bounded solutions of a linear nonhomogeneous system of ordinary differential equations.