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oai:zbmath.org:3045498
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Cartwright, H. L.; Littlewood, J. E.
1947
3045498
English
Princeton University, Mathematics Department, Princeton, NJ
https://zbmath.org/03045498
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Ann. Math. (2) 48, 472-494 (1947).
On non-linear differential equations of the second order. II. The equation \(\ddot y+kf(y)\dot y+g(y,k)=p(t)=p_1(t)+kp_2(t)\); \(k>0,f(y)\geq 1\)
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