Quadratic vector fields in the plane have a finite number of limit cycles
Publications Mathématiques de l'IHÉS, Tome 64 (1986), pp. 111-142 
@article{PMIHES_1986__64__111_0,
     author = {Bamon, Rodrigo},
     title = {Quadratic vector fields in the plane have a finite number of limit cycles},
     journal = {Publications Math\'ematiques de l'IH\'ES},
     pages = {111--142},
     year = {1986},
     publisher = {Institut des Hautes Etudes Scientifiques},
     volume = {64},
     mrnumber = {88d:58095},
     zbl = {0625.58028},
     language = {en},
     url = {https://www.numdam.org/item/PMIHES_1986__64__111_0/}
}
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Bamon, Rodrigo. Quadratic vector fields in the plane have a finite number of limit cycles. Publications Mathématiques de l'IHÉS, Tome 64 (1986), pp. 111-142. https://www.numdam.org/item/PMIHES_1986__64__111_0/

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