TY  - JOUR
AU  - Williams, Kenneth S.
TI  - On A Theorem of Niven
JO  - Canadian mathematical bulletin
PY  - 1967
SP  - 573
EP  - 578
VL  - 10
IS  - 4
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CMB-1967-055-3/
DO  - 10.4153/CMB-1967-055-3
ID  - 10_4153_CMB_1967_055_3
ER  -