Belley, Jean-MarcVirgilio, Michel2021-04-122021-04-122004-03-03Belley, J. M., Virgilio, M. (2004). Periodic Duffing equations with delay. <i>Electronic Journal of Differential Equations, 2004</i>(30), pp. 1-18.1072-6691https://hdl.handle.net/10877/13358Assuming a priori bounds on the mean of a T-periodic function p, we show that the Duffing equation x''(t) + cx'(t) + g(t - τ, x(t - τ), x'(t - τ)) = p(t), with delay τ, admits a T-periodic solution.Text18 pages1 file (.pdf)enAttribution 4.0 InternationalDuffing equationsPeriodic solutionsDelay equationsA priori boundsContraction principleArticle