Analytical Approximate Solutions for the Cubic-Quintic Duffing Oscillator in Terms of Elementary Functions. - Augusto Beléndez; Mariela L. Álvarez; Jorge Francés; Sergio Bleda; Tarsicio Beléndez; Alberto Nájera; Enrique Arribas (J. Appl. Math., 2012)

Exact and approximate solutions for the anti-symmetric quadratic truly nonlinear oscillator. - Augusto Beléndez; Enrique Arribas; Carolina Pascual; Tarsicio Beléndez; Mariela L. Álvarez; Antonio Hernández (Appl. Math. Comput., 2014)

Nonlinear oscillator with power-form elastic-term: Fourier series expansion of the exact solution. - Augusto Beléndez; Jorge Francés; Tarsicio Beléndez; Sergio Bleda; Carolina Pascual; Enrique Arribas (Commun. Nonlinear Sci. Numer. Simul., 2015)