@article{DAN_1993_331_6_a4,
     author = {G. A. Kalyabin},
     title = {Two-sided estimates and exact values of some capacities},
     journal = {Doklady Akademii Nauk},
     pages = {672--673},
     year = {1993},
     volume = {331},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1993_331_6_a4/}
}