@article{IVM_1987_8_a6,
     author = {I. P. Mityuk},
     title = {An upper bound for the product of interior radii of domains, and covering theorems},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {39--47},
     year = {1987},
     number = {8},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1987_8_a6/}
}