@article{10_1007_s10492_014_0039_5,
     author = {Liu, Xin-Ge and Tang, Mei-Lan},
     title = {Existence of positive periodic solutions of higher-order functional difference equations},
     journal = {Applications of Mathematics},
     pages = {25--36},
     publisher = {mathdoc},
     volume = {59},
     number = {1},
     year = {2014},
     doi = {10.1007/s10492-014-0039-5},
     mrnumber = {3164574},
     zbl = {06346370},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.1007/s10492-014-0039-5/}
}