The existence of positive periodic solutions for periodic feedback control systems with delays
2004 ◽
Vol 84
(6)
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pp. 425-430
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Keyword(s):
1990 ◽
Vol 52
(2)
◽
pp. 377-387
◽
Keyword(s):
1984 ◽
Vol 29
(5)
◽
pp. 450-452
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