Some theorems on the existence, uniqueness and non existence of limit cycles for quadratic systems

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@article{51281cfec7784e379cdec31eefe87ad2,

title = "Some theorems on the existence, uniqueness and non existence of limit cycles for quadratic systems",

author = "B. Coll and A. Gasull and J. Llibre",

year = "1987",

month = jan,

day = "1",

language = "English",

volume = "67",

pages = "372--399",

journal = "Journal of Differential Equations",

issn = "0022-0396",

publisher = "Academic Press Inc.",

}