2026-04-13T00:34:29Zhttps://recercat.cat/oai/request

oai:recercat.cat:2072/4105762026-03-13T03:21:48Zcom_2072_98col_2072_378192

00925njm 22002777a 4500 dc Llibre, Jaume author Rodrigues, Ana author 2013 Agraïments: The second author was supported by FCT Grant BPD/36072/2007. Research of AR supported in part by Centro de Matemática da Universidade do Porto (CMUP) financed by FCT through the programmes POCTI and POSI, with Portuguese and European Community structural funds. We study the periodic orbits of the modified Duffing differential equation ¨y + ay - εy3 = εh(y, y˙), with a. A note of the periodic orbits of a kind of Duffing equations