MathSciNet bibliographic data MR385239 (52 #6104) 34C25 Fučík, Svatopluk; Lovicar, Vladimír Periodic solutions of the equation $x\sp{\sp{\prime\prime}}(t)+g(x(t))=p(t)$$x\sp{\sp{\prime\prime}}(t)+g(x(t))=p(t)$. Časopis Pěst. Mat. 100 (1975), no. 2, 160–175. Links to the journal or article are not yet available

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