@article{10_4153_CMB_1988_023_4,
     author = {Bella, A. and Cammaroto, F.},
     title = {On the {Cardinality} of {Urysohn} {Spaces}},
     journal = {Canadian mathematical bulletin},
     pages = {153--158},
     year = {1988},
     volume = {31},
     number = {2},
     doi = {10.4153/CMB-1988-023-4},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1988-023-4/}
}