Karfes S, Hadidi E. Periodic solutions of a differential perturbed system via the averaging theory and the Melnikov method. J. Innov. Appl. Math. Comput. Sci [Internet]. 2023 Jul. 1 [cited 2024 May 12];3(1):49-65. Available from: https://jiamcs.centre-univ-mila.dz/index.php/jiamcs/article/view/59