@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/