%0 Journal Article %A Neumann, B. H. %T Some Group Presentations %J Canadian journal of mathematics %D 1978 %P 838-850 %V 30 %N 4 %U http://geodesic.mathdoc.fr/articles/10.4153/CJM-1978-072-2/ %R 10.4153/CJM-1978-072-2 %F 10_4153_CJM_1978_072_2