@article{1077475896,
author = {Sherman, Seymour},
title = {A problem of Ra\u\i kov},
journal = {Duke Math. J.},
volume = {17},
number = {1},
year = {1950},
pages = { 21-26},
language = {en},
url = {http://dml.mathdoc.fr/item/1077475896}
}
Sherman, Seymour. A problem of Raĭkov. Duke Math. J., Tome 17 (1950) no. 1, pp. 21-26. http://gdmltest.u-ga.fr/item/1077475896/