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These systems have no limit cycles. Only three phase portraits have a center, 19 of these phase portraits have one polycycle, three of these phase portraits have two polycycles. The maximum number of separartices that have these phase portraits is 26 and the minimum number is nine, the maximum number of canonical regions of these phase portraits is seven and the minimum is three. <\/jats:p>","DOI":"10.1142\/s0218127423500037","type":"journal-article","created":{"date-parts":[[2023,2,10]],"date-time":"2023-02-10T09:47:44Z","timestamp":1676022464000},"source":"Crossref","is-referenced-by-count":2,"title":["Global Phase Portraits of the Quadratic Systems Having a Singular and Irreducible Invariant Curve of Degree 3"],"prefix":"10.1142","volume":"33","author":[{"given":"J.","family":"Llibre","sequence":"first","affiliation":[{"name":"Departament de Matem\u00e0tiques, Universitat Aut\u00f2noma de Barcelona, Edifici C, 08193 Bellaterra, Barcelona, Catalonia, Spain"}]},{"given":"C.","family":"Pantazi","sequence":"additional","affiliation":[{"name":"Departament de Matem\u00e0tiques, Universitat Polit\u00e8cnica de Catalunya, (EPSEB), Av. 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