@article{MM3_2018_22_2_a5,
     author = {Hocine Gabsi and Abdelouaheb Ardjouni and Ahcene Djoudi},
     title = {Positive periodic solutions of second-order nonlinear neutral differential equations with variable coefficients},
     journal = {Mathematica Moravica},
     pages = {69 - 82},
     publisher = {mathdoc},
     volume = {22},
     number = {2},
     year = {2018},
     url = {https://geodesic-test.mathdoc.fr/item/MM3_2018_22_2_a5/}
}