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J. Chavarriga, I. A. García, J. Giné, E. Ribereau.
Quadratic systems having third degree invariant algebraic curves.
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J. Chavarriga, H. Giacomini, J. Giné.
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On the quartic algebraic solutions of quadratic systems.
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A. Cima, A. Gasull, F. Mañosas.
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B. Coll, A. Gasull, R. Prohens.
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