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@article{IM_1988__94_2_143618, author = {Stephen G. Brick}, title = {Normal-convexity and equations over groups.}, journal = {Inventiones mathematicae}, pages = {81--104}, publisher = {mathdoc}, volume = {94}, number = {2}, year = {1988}, zbl = {0655.20025}, url = {http://geodesic.mathdoc.fr/item/IM_1988__94_2_143618/} }
Stephen G. Brick. Normal-convexity and equations over groups.. Inventiones mathematicae, Tome 94 (1988) no. 2, pp. 81-104. http://geodesic.mathdoc.fr/item/IM_1988__94_2_143618/