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      On the integrability problem for the Hopf-zero singularity and its relation with the inverse Jacobi multiplier 

      Algaba, A.; Fuentes, N.; Gamero Gutiérrez, Estanislao; García, C. (Elsevier Inc., 2021)
      In this paper we use the orbital normal form of the nondegenerate Hopf-zero singularity to obtain necessary conditions for ...
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      On the Takens-Bogdanov Bifurcation in the Chua’s Equation 

      Algaba Durán, Antonio; Freire Macías, Emilio; Gamero Gutiérrez, Estanislao; Rodríguez Luis, Alejandro José (Institute of Electronics, Information and Communication Engineers, 1999)
      The analysis of the Takens-Bogdanov bifurcation of the equilibrium at the origin in the Chua’s equation with a cubic ...
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      Orbital Hypernormal Forms 

      Algaba Durán, Antonio; Gamero Gutiérrez, Estanislao; García García, Cristóbal (MDPI, 2021-08)
      In this paper, we analyze the problem of determining orbital hypernormal forms—that is, the simplest analytical expression ...