[1]
Juan E. Napoles Valdes, Luciano M. Lugo Motta Bittencurt and Paulo M. Guzman 2015. A Note on the Continuability of Solutions of a Perturbed Second Order Nonlinear Differential Equation of Lienard Type. International Journal of Mathematics And its Applications. 3, 4 - E (Dec. 2015), 15–21.