Geodesic
On the diagonal number of topological spaces
Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 6 (1990), pp. 84-86 
A. N. Yakivchik. On the diagonal number of topological spaces. Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 6 (1990), pp. 84-86. http://geodesic.mathdoc.fr/item/VMUMM_1990_6_a23/
@article{VMUMM_1990_6_a23,
     author = {A. N. Yakivchik},
     title = {On the diagonal number of topological spaces},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {84--86},
     year = {1990},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1990_6_a23/}
}
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