@article{10_4153_CJM_1967_040_9,
     author = {Borges, Carlos J. R.},
     title = {On {Extensions} of {Topologies}},
     journal = {Canadian journal of mathematics},
     pages = {474--487},
     year = {1967},
     volume = {19},
     number = {1},
     doi = {10.4153/CJM-1967-040-9},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1967-040-9/}
}