@article{NSJOM_1986_16_2a_5,
     author = {Budin\v{c}evi\'c Mirko},
     title = {Perturbations of a linear difference 

 equation},
     journal = {Novi Sad Journal of Mathematics},
     pages = {53-62},
     publisher = {mathdoc},
     volume = {16},
     number = {2},
     year = {1986},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_1986_16_2a_5/}
}