Geodesic
Existence of positive periodic solutions for fourth-order nonlinear neutral differential equations with variable coefficients
Buletinul Academiei de Ştiinţe a Republicii Moldova. Matematica, no. 3 (2019), pp. 10-21

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In this work, we study the existence of positive periodic solutions for fourth-order nonlinear neutral differential equations with variable coefficients. The results are established by using the Krasnoselskii's fixed point theorem. An example is given to illustrate this work. 
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Bouzid Mansouri; Abdelouaheb Ardjouni; Ahcene Djoudi. Existence of positive periodic solutions for fourth-order nonlinear neutral differential equations with variable coefficients. Buletinul Academiei de Ştiinţe a Republicii Moldova. Matematica, no. 3 (2019), pp. 10-21. http://geodesic.mathdoc.fr/item/BASM_2019_3_a1/