@article{BMMS_2013_36_4_a21,
     author = {Xiao-Bin Zhang and Hong-Xun Yi},
     title = {On {Some} {Problems} of {Difference} {Functions} and {Difference} {Equations}},
     journal = {Bulletin of the Malaysian Mathematical Society},
     year = {2013},
     volume = {36},
     number = {4},
     url = {http://geodesic.mathdoc.fr/item/BMMS_2013_36_4_a21/}
}