@article{DE_1994_30_10_a8,
     author = {V. V. Volchkov},
     title = {Theorems on two radii on bounded domains of {Euclidean} spaces},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1719--1724},
     publisher = {mathdoc},
     volume = {30},
     number = {10},
     year = {1994},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1994_30_10_a8/}
}