%0 Journal Article %A Parmenter, M, M. %T On a Theorem of Bovdi %J Canadian journal of mathematics %D 1971 %P 929-932 %V 23 %N 5 %U http://geodesic.mathdoc.fr/articles/10.4153/CJM-1971-101-x/ %R 10.4153/CJM-1971-101-x %F 10_4153_CJM_1971_101_x