@article{IVM_1999_10_a7,
     author = {G. S. Tyugashov},
     title = {$k$-expansion of topological spaces, and convexity},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {43--48},
     publisher = {mathdoc},
     number = {10},
     year = {1999},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1999_10_a7/}
}