1.
Mansouri B, Ardjouni A, Djoudi A. Periodicity and stability in neutral nonlinear differential equations by Krasnoselskii‘s fixed point theorem. CUBO [Internet]. 2017 Oct. 1 [cited 2024 May 14];19(3):15–29. Available from: https://cubo.ufro.cl/ojs/index.php/cubo/article/view/1626