@article{10_4153_CMB_2017_019_3,
     author = {Ko\v{s}an, Tamer and Sahinkaya, Serap and Zhou, Yiqiang},
     title = {Additive {Maps} on {Units} of {Rings}},
     journal = {Canadian mathematical bulletin},
     pages = {130--141},
     year = {2018},
     volume = {61},
     number = {1},
     doi = {10.4153/CMB-2017-019-3},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-2017-019-3/}
}