Periodic solutions of $x" + f(x)x'^m + g(x) = 0$
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چکیده
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ژورنال
عنوان ژورنال: Annales Polonici Mathematici
سال: 1971
ISSN: 0066-2216,1730-6272
DOI: 10.4064/ap-24-3-327-330