Periodic solutions for a class of second order delay differential systems
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2016 ◽
Vol 36
(9)
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pp. 4925-4943
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2004 ◽
Vol 8
(4)
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pp. 639-652
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2019 ◽
Vol 42
(5)
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pp. 1377-1388
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2012 ◽
Vol 252
(10)
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pp. 5712-5734
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