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@article{10_21136_CMJ_1972_101078, author = {Bican, Ladislav}, title = {Pure closures}, journal = {Czechoslovak Mathematical Journal}, pages = {78--82}, publisher = {mathdoc}, volume = {22}, number = {1}, year = {1972}, doi = {10.21136/CMJ.1972.101078}, mrnumber = {0294385}, zbl = {0235.16026}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1972.101078/} }
Bican, Ladislav. Pure closures. Czechoslovak Mathematical Journal, Tome 22 (1972) no. 1, pp. 78-82. doi : 10.21136/CMJ.1972.101078. http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1972.101078/
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