@article{10_1007_s10492_011_0034_z,
     author = {Tang, Mei-Lan and Liu, Xin-Ge},
     title = {Positive periodic solution for ratio-dependent $n$-species discrete time system},
     journal = {Applications of Mathematics},
     pages = {577--589},
     publisher = {mathdoc},
     volume = {56},
     number = {6},
     year = {2011},
     doi = {10.1007/s10492-011-0034-z},
     mrnumber = {2886239},
     zbl = {1249.39008},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.1007/s10492-011-0034-z/}
}