@article{SJVM_2019_22_1_a0,
     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},
     pages = {1--14},
     publisher = {mathdoc},
     volume = {22},
     number = {1},
     year = {2019},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/SJVM_2019_22_1_a0/}
}