@article{oai:tsukuba.repo.nii.ac.jp:00029814,
 author = {Luca, Florian and Shparlinski, Igor E.},
 issue = {2},
 journal = {Tsukuba Journal of Mathematics},
 month = {Dec},
 pages = {439--449},
 title = {On the number of polynomial maps into Z_n},
 volume = {30},
 year = {2006}
}