Positive periodic solutions of first-order singular systems
2012 ◽
Vol 218
(23)
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pp. 11421-11428
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2011 ◽
Vol 218
(5)
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pp. 1605-1610
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Keyword(s):
2009 ◽
Vol 229
(1)
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pp. 327-332
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2017 ◽
Vol 17
(2)
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pp. 375-386
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2016 ◽
Vol 40
(1)
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pp. 205-209
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Keyword(s):
2013 ◽
Vol 219
(11)
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pp. 6074-6083
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