On bounded, periodic, and almost periodic solutions for a system of nonlinear second-order ordinary differential equations
1977 ◽
Vol 61
(3)
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pp. 620-632
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1991 ◽
Vol 7
(4)
◽
pp. 354-359
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1964 ◽
Vol 65
(1)
◽
pp. 389-405
◽
1968 ◽
Vol 4
(4)
◽
pp. 543-548
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1966 ◽
Vol 2
(3)
◽
pp. 305-319
◽
1978 ◽
Vol 62
(1)
◽
pp. 63-67
◽
2011 ◽
Vol 140
(1)
◽
pp. 279-289
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