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中国科学院数学与系统科学研究院期刊网
ISSN 1439-8516 CN 11-2039/O1
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Periodic Solutions for Second Order Systems at Resonance
Tang Chunlei
Acta Mathematica Sinica . 1998, (
4
): 433 -440 . DOI: 10.1007/BF02580399
