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v15_n1_An estimative for the number of limit cycles in a Li ́enard-like perturbation of a quadratic non-linear center.pdfv15_n1_An estimative for the number of limit cycles in a Li ́enard-like perturbation of a quadratic non-linear center
v15_n1_Quadratic systems with invariant hyperbolas  a complete classification in the space R 12.pdfv15_n1_Quadratic systems with invariant hyperbolas a complete classification in the space R 12
v15_n1_Singular levels and topological invariants of Morse Bott sy stems on surfaces.pdfv15_n1_Singular levels and topological invariants of Morse Bott sy stems on surfaces
v15_n1_Multiple solutions for an elliptic system near resonance.pdfv15_n1_Multiple solutions for an elliptic system near resonance
v15_n1_New examples of Neuwirth–Stallings pairs and non-trivial real Milnor fibrations.pdfv15_n1_New examples of Neuwirth–Stallings pairs and non-trivial real Milnor fibrations
v15_n1_Second order geometry of spacelike surfaces in de Sitter 5-space.pdfv15_n1_Second order geometry of spacelike surfaces in de Sitter 5-space