%0 Journal Article %T Samuel Beatty %J Canadian mathematical bulletin %D 1971 %P 489-490 %V 14 %N 4 %U http://geodesic.mathdoc.fr/articles/10.4153/CMB-1971-086-1/ %R 10.4153/CMB-1971-086-1 %F 10_4153_CMB_1971_086_1