MR0803402
Tersian, Stepan
Stepan TERSIAN
On the periodic problem for the equation {$x''(t)+g(x(t))=f(t)$}
Funkcialaj Ekvacioj. Serio Internacia
28
1985
39--46
http://fe.math.kobe-u.ac.jp/FE/Free/vol28/fe28-1-3.pdf
http://fe.math.kobe-u.ac.jp/FE/FE_pdf_with_bookmark/FE21-30-en_KML/fe28-039-046/fe28-039-046.pdf
http://www.ams.org/mathscinet-getitem?mr=MR0803402
fe28-039-046
1985
On the Periodic Problem for the Equation $x''(t)+g(x(t))=f(t)$
TERSIAN, Stepan
TERSIAN, Stepan
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