@article{KUKZ_1992_27_27_a3,
     author = {A. V. Kazantsev},
     title = {On a problem related to the extremum of the inner radius},
     journal = {Trudy seminara po kraevym zada\v{c}am},
     pages = {47--62},
     year = {1992},
     volume = {27},
     number = {27},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/KUKZ_1992_27_27_a3/}
}