Oscillations of a class of second-order nonlinear delay differential equations with variable sign coefficients
2006 ◽
Vol 43
(7-8)
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pp. 854-869
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2010 ◽
Vol 233
(9)
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pp. 2105-2111
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2014 ◽
Vol 32
(3_4)
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pp. 447-454
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1970 ◽
Vol 30
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pp. 695-701
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Vol 48
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