@article{10_4153_CMB_1979_041_3,
     author = {Papick, Ira J.},
     title = {Coherent {Overrings}},
     journal = {Canadian mathematical bulletin},
     pages = {331--337},
     year = {1979},
     volume = {22},
     number = {3},
     doi = {10.4153/CMB-1979-041-3},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1979-041-3/}
}