@article{10_4153_CMB_2008_034_8,
     author = {Bennett, Michael A.},
     title = {Differences between {Perfect} {Powers}},
     journal = {Canadian mathematical bulletin},
     pages = {337--347},
     year = {2008},
     volume = {51},
     number = {3},
     doi = {10.4153/CMB-2008-034-8},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-2008-034-8/}
}