@article{PIM_1979_N_S_25_39_a12,
     author = {{\DJ}uro Kurepa},
     title = {A {Classification} {Of} {Topological} {Spaces.} {Z-Number} {Of} {Spaces}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {79 },
     publisher = {mathdoc},
     volume = {_N_S_25},
     number = {39},
     year = {1979},
     url = {http://geodesic.mathdoc.fr/item/PIM_1979_N_S_25_39_a12/}
}