Geodesic
Nowhere dense subsets of $N^*$ and types of ultrafilters
Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 3 (1989), pp. 59-61 
S. A. Logunov; V. I. Malykhin. Nowhere dense subsets of $N^*$ and types of ultrafilters. Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 3 (1989), pp. 59-61. http://geodesic.mathdoc.fr/item/VMUMM_1989_3_a16/
@article{VMUMM_1989_3_a16,
     author = {S. A. Logunov and V. I. Malykhin},
     title = {Nowhere dense subsets of $N^*$ and types of ultrafilters},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {59--61},
     year = {1989},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1989_3_a16/}
}
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