MR1199469
Arino, O. and Ch{é}rif, A. A.
O. ARINO and A. A. CHERIF
On the existence of periodic solutions for a class of nonlinearly forced systems
Funkcialaj Ekvacioj. Serio Internacia
35
1992
485--503
http://fe.math.kobe-u.ac.jp/FE/Free/vol35/fe35-3-5.pdf
http://fe.math.kobe-u.ac.jp/FE/FE_pdf_with_bookmark/FE35-40-en_KML/fe35-485-503/fe35-485-503.pdf
http://www.ams.org/mathscinet-getitem?mr=MR1199469
fe35-485-503
1992
On the Existence of Periodic Solutions for a Class of Nonlinearly Forced Systems
ARINO, O.; CHERIF, A. A.
ARINO, O.; CHERIF, A. A.
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