@article{BASM_2019_3_a1,
     author = {Bouzid Mansouri and Abdelouaheb Ardjouni and Ahcene Djoudi},
     title = {Existence of positive periodic solutions for fourth-order nonlinear neutral differential equations with variable coefficients},
     journal = {Buletinul Academiei de \c{S}tiin\c{t}e a Republicii Moldova. Matematica},
     pages = {10--21},
     publisher = {mathdoc},
     number = {3},
     year = {2019},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/BASM_2019_3_a1/}
}