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@article{IM_1977__42_142497, author = {G. van der Geer and D. Zagier}, title = {The {Hilbert} {Modular} {Group} for the {Field} ...(...13).}, journal = {Inventiones mathematicae}, pages = {93--134}, publisher = {mathdoc}, volume = {42}, year = {1977}, zbl = {0366.10024}, url = {http://geodesic.mathdoc.fr/item/IM_1977__42_142497/} }
G. van der Geer; D. Zagier. The Hilbert Modular Group for the Field ...(...13).. Inventiones mathematicae, Tome 42 (1977), pp. 93-134. http://geodesic.mathdoc.fr/item/IM_1977__42_142497/