@article{GMJ_2004__11_1_51220,
     author = {Tang, Xian Hua and Cheng, Sui Sun},
     title = {Positive solutions of a neutral difference equation with positive and negative coefficients.},
     journal = {Georgian Mathematical Journal},
     pages = {177--185},
     publisher = {mathdoc},
     volume = {11},
     number = {1},
     year = {2004},
     zbl = {1059.39009},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/GMJ_2004__11_1_51220/}
}