Geodesic
On The Category Number Of Topological Spaces
Publications de l'Institut Mathématique, _N_S_08 (1968) no. 22, p. 149 
Đuro Kurepa. On The Category Number Of Topological Spaces. Publications de l'Institut Mathématique, _N_S_08 (1968) no. 22, p. 149 . http://geodesic.mathdoc.fr/item/PIM_1968_N_S_08_22_a22/
@article{PIM_1968_N_S_08_22_a22,
     author = {{\DJ}uro Kurepa},
     title = {On {The} {Category} {Number} {Of} {Topological} {Spaces}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {149 },
     year = {1968},
     volume = {_N_S_08},
     number = {22},
     url = {http://geodesic.mathdoc.fr/item/PIM_1968_N_S_08_22_a22/}
}
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