@article{10_4153_CMB_1981_029_x,
     author = {Ong, Sing-Cheong},
     title = {Operator {Topologies} and {Invariant} {Operator} {Ranges}},
     journal = {Canadian mathematical bulletin},
     pages = {181--185},
     year = {1981},
     volume = {24},
     number = {2},
     doi = {10.4153/CMB-1981-029-x},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1981-029-x/}
}