Periodic solutions for a second order nonlinear functional differential equation
2007 ◽
Vol 20
(1)
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pp. 110-115
◽
1971 ◽
Vol 33
(2)
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pp. 258-262
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2021 ◽
2012 ◽
Vol 616-618
◽
pp. 2137-2141
2004 ◽
Vol 157
(2)
◽
pp. 433-448
◽
2017 ◽
Vol 22
(6-1)
◽
pp. 1329-1334