Subjects: “...phase portrait...”
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Subjects: “...phase portrait...”
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Subjects: “...global phase portraits...”
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Subjects: “...Quadratic system, first integral, global phase portraits,...”
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“...We classify the phase portraits of quadratic polynomial differential systems having some relevant...”
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Subjects: “...global phase portrait...”
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Subjects: “...phase portrait...”
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“... of them having a first integral, then its phase portrait is completely determined. While the existence...”
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“..., k \in \mathbb{R}$. Moreover we study the phase portraits in the Poincare disk of these systems when...”
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