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@article{MS2_1981__48_166746, author = {A.H.M. Hoare}, title = {Nielsen methods in groups with a length function.}, journal = {Mathematica Scandinavica}, pages = {153--164}, publisher = {mathdoc}, volume = {48}, year = {1981}, zbl = {0463.20023}, url = {http://geodesic.mathdoc.fr/item/MS2_1981__48_166746/} }
A.H.M. Hoare. Nielsen methods in groups with a length function.. Mathematica Scandinavica, Tome 48 (1981), pp. 153-164. http://geodesic.mathdoc.fr/item/MS2_1981__48_166746/