Positive periodic solutions of singular systems with a parameter
2010 ◽
Vol 249
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pp. 2986-3002
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2011 ◽
Vol 218
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pp. 1605-1610
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2012 ◽
Vol 218
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pp. 11421-11428
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2005 ◽
Vol 18
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pp. 1256-1264
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2010 ◽
Vol 2010
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pp. 1-22
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2006 ◽
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2012 ◽
Vol 42
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2005 ◽
Vol 211
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pp. 282-302
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