@article{10_4153_CMB_2000_031_6,
     author = {Voloch, Jos\'e Felipe},
     title = {On a {Question} of {Buium}},
     journal = {Canadian mathematical bulletin},
     pages = {236--238},
     year = {2000},
     volume = {43},
     number = {2},
     doi = {10.4153/CMB-2000-031-6},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-2000-031-6/}
}