Existence of three positive periodic solutions of nonlinear neutral functional differential equations with impulses and delays
2008 ◽
Vol 21
(6)
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pp. 581-587
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2002 ◽
Vol 17
(4)
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pp. 382-390
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2010 ◽
Vol 52
(9-10)
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pp. 1451-1462
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2008 ◽
Vol 9
(5)
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pp. 2214-2221
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