A Simple Proof for the Unicity of the Limit Cycle in the Bogdanov-Takens System
Canadian mathematical bulletin, Tome 33 (1990) no. 1, pp. 84-92

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We show that the Bogdanov-Takens system has at most one limit cycle. Similarly we show that the maximum number of limit cycles in the universal unfolding of the symmetric cusp of order 2 (resp. 3) is one (resp. 2). The proof uses the elementary technique of Liénard's equation, yielding a global result for all values of the parameters.
DOI : 10.4153/CMB-1990-015-3
Mots-clés : 34C05, 34C35, 39
Li, Chengzhi; Rousseau, Christiane; Wang, Xian. A Simple Proof for the Unicity of the Limit Cycle in the Bogdanov-Takens System. Canadian mathematical bulletin, Tome 33 (1990) no. 1, pp. 84-92. doi: 10.4153/CMB-1990-015-3
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     title = {A {Simple} {Proof} for the {Unicity} of the {Limit} {Cycle} in the {Bogdanov-Takens} {System}},
     journal = {Canadian mathematical bulletin},
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     year = {1990},
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     number = {1},
     doi = {10.4153/CMB-1990-015-3},
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