The Existence of Periodic Orbits and Invariant Tori for Some 3-Dimensional Quadratic Systems
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We use the normal form theory, averaging method, and integral manifold theorem to study the existence of limit cycles in Lotka-Volterra systems and the existence of invariant tori in quadratic systems inℝ3.
2020 ◽
Vol 30
(16)
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pp. 2030050
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2016 ◽
Vol 26
(05)
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pp. 1650079
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2018 ◽
Vol 28
(11)
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pp. 1850139
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2019 ◽
Vol 29
(11)
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pp. 1950154
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2016 ◽
Vol 436
(1)
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pp. 521-555
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