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@article{MZ_1963__81_170147, author = {M.J. Dunwoody}, title = {On {Relation} {Groups.}}, journal = {Mathematische Zeitschrift}, pages = {180--186}, publisher = {mathdoc}, volume = {81}, year = {1963}, zbl = {0113.25205}, url = {http://geodesic.mathdoc.fr/item/MZ_1963__81_170147/} }
M.J. Dunwoody. On Relation Groups.. Mathematische Zeitschrift, Tome 81 (1963), pp. 180-186. http://geodesic.mathdoc.fr/item/MZ_1963__81_170147/