On concentrated sets and N-sets
Acta Universitatis Carolinae. Mathematica et Physica, Tome 31 (1990) no. 2, pp. 47-50.

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Classification : 03E15, 03E35, 42A28, 43A46 
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     author = {Kholshchevnikova, N. N.},
     title = {On concentrated sets and {N-sets}},
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Kholshchevnikova, N. N. On concentrated sets and N-sets. Acta Universitatis Carolinae. Mathematica et Physica, Tome 31 (1990) no. 2, pp. 47-50. https://geodesic-test.mathdoc.fr/item/AUCMP_1990__31_2_a7/