Geodesic
Positive periodic solutions for a class of fourth-order nonlinear differential equations
Sibirskij žurnal vyčislitelʹnoj matematiki, Tome 22 (2019) no. 1, pp. 1-14

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In this paper, we obtain the existence and uniqueness of periodic solutions for a nonlinear fourth-order differential equation utilizing an explicit Green’s function and fixed point index theorem combining with an operator spectral theorem. We discuss an iteration method for constant coefficient nonlinear differential equations and establish a theorem on the existence of positive solutions for fourth-order boundary value problem with variable parameter. Finally, we give an example to illustrate our results. 
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     author = {N. Bouteraa and S. Benaicha},
     title = {Positive periodic solutions for a class of fourth-order nonlinear differential equations},
     journal = {Sibirskij \v{z}urnal vy\v{c}islitelʹnoj matematiki},
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     publisher = {mathdoc},
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     year = {2019},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/SJVM_2019_22_1_a0/}
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N. Bouteraa; S. Benaicha. Positive periodic solutions for a class of fourth-order nonlinear differential equations. Sibirskij žurnal vyčislitelʹnoj matematiki, Tome 22 (2019) no. 1, pp. 1-14. http://geodesic.mathdoc.fr/item/SJVM_2019_22_1_a0/