On the existence of periodic solutions for nonlinear ordinary differential equations in Banach spaces

MR0597420 Kat{\^o}, Shigeo Shigeo KATO On the existence of periodic solutions for nonlinear ordinary differential equations in Banach spaces Fako de l'Funkcialaj Ekvacioj Japana Matematika Societo. Funkcialaj Ekvaciog. Serio Internacia 23 1980 143--149 http://fe.math.kobe-u.ac.jp/FE/Free/vol23/fe23-2-3.pdf http://fe.math.kobe-u.ac.jp/FE/FE_pdf_with_bookmark/FE21-30-en_KML/fe23-143-149/fe23-143-149.pdf http://www.ams.org/mathscinet-getitem?mr=MR0597420 fe23-143-149 1980 On the Existence of Periodic Solutions for Nonlinear Ordinary Differential Equations in Banach Spaces KATO, Shigeo KATO, Shigeo

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