Periodic solutions for second order singular damped differential equations☆
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Keywords
Periodic solution
Singular damped differential equation
Greenʼs function
Leray–Schauder alternative principle
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Jifeng Chu was supported by the National Natural Science Foundation of China (Grant No. 10801044 and No. 11171090), Jiangsu Natural Science Foundation (Grant No. BK2008356), the Program for New Century Excellent Talents in University (Grant No. NCET-10-0325), China Postdoctoral Science Foundation funded project (Grant No. 20110491345) and the Fundamental Research Funds for the Central Universities. Pedro J. Torres was supported by Ministerio de Educación y Ciencia, Spain, project MTM2011-23652.
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