%0 Journal Article %A Fillmore, Peter A. %T On Products of Symmetries %J Canadian journal of mathematics %D 1966 %P 897-900 %V 18 %N 1 %U http://geodesic.mathdoc.fr/articles/10.4153/CJM-1966-090-5/ %R 10.4153/CJM-1966-090-5 %F 10_4153_CJM_1966_090_5