@article{10_21136_CMJ_1979_101574,
     author = {\v{S}marda, Bohumil},
     title = {Polarity compatible with a closure system},
     journal = {Czechoslovak Mathematical Journal},
     pages = {13--20},
     publisher = {mathdoc},
     volume = {29},
     number = {1},
     year = {1979},
     doi = {10.21136/CMJ.1979.101574},
     mrnumber = {518136},
     zbl = {0387.06002},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1979.101574/}
}