BoichukО. A., and PokutnyiО. О. 2014. “Exponential Dichotomy and Bounded Solutions of Differential Equations in the Fréchet Space”. Ukrains’kyi Matematychnyi Zhurnal 66 (12), 1587-97. https://umj.imath.kiev.ua/index.php/umj/article/view/2248.