Periodic Solutions of X" + F(μ, X) = 0
Annales Polonici Mathematici- Poland
doi 10.4064/ap-36-1-29-41
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January 1, 1979
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Institute of Mathematics, Polish Academy of Sciences
doi 10.4064/ap-36-1-29-41
Available in
January 1, 1979
Institute of Mathematics, Polish Academy of Sciences