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@article{IM_1988__91_3_143550, author = {Avner Ash}, title = {Non-minimal modular symbols for {GL(n).}}, journal = {Inventiones mathematicae}, pages = {483--492}, publisher = {mathdoc}, volume = {91}, number = {3}, year = {1988}, zbl = {0671.22005}, url = {http://geodesic.mathdoc.fr/item/IM_1988__91_3_143550/} }
Avner Ash. Non-minimal modular symbols for GL(n).. Inventiones mathematicae, Tome 91 (1988) no. 3, pp. 483-492. http://geodesic.mathdoc.fr/item/IM_1988__91_3_143550/