@article{10_4153_CMB_1977_070_4,
     author = {Rowe, K. A.},
     title = {Images in {Topoi}},
     journal = {Canadian mathematical bulletin},
     pages = {471--478},
     year = {1977},
     volume = {20},
     number = {4},
     doi = {10.4153/CMB-1977-070-4},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1977-070-4/}
}