@article{AUCMP_1987_28_1_a8,
     author = {Zaj{\'\i}\v{c}ek, L.},
     title = {Alternative definitions of $J$-density topology},
     journal = {Acta Universitatis Carolinae. Mathematica et Physica},
     pages = {57--61},
     year = {1987},
     volume = {28},
     number = {1},
     mrnumber = {0929266},
     zbl = {0666.26002},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AUCMP_1987_28_1_a8/}
}