$Z_N$-classification, and approximation of sets
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 8 (1972), pp. 60-69.

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@article{IVM_1972_8_a7,
     author = {Z. I. Kozlova},
     title = {$Z_N$-classification, and approximation of sets},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {60--69},
     publisher = {mathdoc},
     number = {8},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1972_8_a7/}
}
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Z. I. Kozlova. $Z_N$-classification, and approximation of sets. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 8 (1972), pp. 60-69. http://geodesic.mathdoc.fr/item/IVM_1972_8_a7/